diff --git a/appframework/wscript b/appframework/wscript
index d5126d96..29822a4b 100755
--- a/appframework/wscript
+++ b/appframework/wscript
@@ -18,13 +18,24 @@ def build(bld):
 	source = [
 		'AppSystemGroup.cpp',
 		'../public/filesystem_init.cpp',
-#		'vguimatsysapp.cpp'	[$WIN32]
-#		'winapp.cpp'		[$WIN32]
-		'posixapp.cpp',#		[$POSIX]
-		'sdlmgr.cpp'#		[$SDL]
 #		'glmrendererinfo_osx.mm'		[$OSXALL]
 	]
 
+	if bld.env.SDL:
+		source += [
+			'sdlmgr.cpp'
+		]
+
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'vguimatsysapp.cpp',
+			'winapp.cpp'
+		]
+	else:
+		source += [
+			'posixapp.cpp',#		[$POSIX]
+		]
+
 	includes = [
 		'.',
 		'../public',
diff --git a/bitmap/wscript b/bitmap/wscript
index dae3a16f..8c32f45a 100755
--- a/bitmap/wscript
+++ b/bitmap/wscript
@@ -21,7 +21,6 @@ def build(bld):
 		'float_bm.cpp',
 		'float_bm2.cpp',
 		'float_bm3.cpp',
-		 #'float_bm4.cpp',	[$WINDOWS]
 		'float_bm_bilateral_filter.cpp',
 		'float_cube.cpp',
 		'imageformat.cpp',
@@ -31,6 +30,11 @@ def build(bld):
 		'tgawriter.cpp',
 		'bitmap.cpp'
 	]
+	
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'float_bm4.cpp'
+		]
 
 	includes = [
 		'.',
@@ -43,6 +47,9 @@ def build(bld):
 	defines = []
 
 	libs = []
+	
+	if bld.env.DEST_OS == 'win32':
+		libs += ['NVTC', 'ATI_COMPRESS_MT_VC10']
 
 	bld.stlib(
 		source   = source,
diff --git a/dedicated/wscript b/dedicated/wscript
index 485ef288..adb01eb8 100755
--- a/dedicated/wscript
+++ b/dedicated/wscript
@@ -24,11 +24,8 @@ def build(bld):
 		'../common/SteamAppStartup.cpp',
 		'sys_common.cpp',
 		'sys_ded.cpp',
-		#'sys_windows.cpp', [$WINDOWS]
-		'sys_linux.cpp', # [$POSIX]
 		'console/conproc.cpp',
 		'console/textconsole.cpp',
-		'console/TextConsoleUnix.cpp', # [$POSIX]
 		'../filesystem/filetracker.cpp',
 		'../filesystem/basefilesystem.cpp',
 		'../filesystem/packfile.cpp',
@@ -36,9 +33,19 @@ def build(bld):
 		'../filesystem/filesystem_stdio.cpp',
 		'../filesystem/QueuedLoader.cpp',
 		'../public/zip_utils.cpp',
-		'../filesystem/linux_support.cpp' # [$POSIX]
 	]
 
+	if bld.env.DEST_OS == 'win32'
+		source += [
+			'sys_windows.cpp'
+		]
+	else:
+		source += [
+			'sys_linux.cpp', # [$POSIX]
+			'console/TextConsoleUnix.cpp', # [$POSIX]
+			'../filesystem/linux_support.cpp' # [$POSIX]
+		]
+
 	includes = [
 		'.',
 		'../public',
diff --git a/engine/audio/private/snd_dev_direct.cpp b/engine/audio/private/snd_dev_direct.cpp
index fad4752d..a60e181b 100644
--- a/engine/audio/private/snd_dev_direct.cpp
+++ b/engine/audio/private/snd_dev_direct.cpp
@@ -11,7 +11,7 @@
 // Fix for VS 2010 build errors copied from Dota
 #if !defined( NEW_DXSDK ) && ( _MSC_VER >= 1600 )
 #undef KSDATAFORMAT_SUBTYPE_WAVEFORMATEX
-#undef KSDATAFORMAT_SUBTYPE_PCM
+//#undef KSDATAFORMAT_SUBTYPE_PCM
 #undef KSDATAFORMAT_SUBTYPE_IEEE_FLOAT
 #endif
 #include <ksmedia.h>
diff --git a/engine/wscript b/engine/wscript
index 29a03ad8..117e5047 100755
--- a/engine/wscript
+++ b/engine/wscript
@@ -171,7 +171,6 @@ def build(bld):
 		'sys_dll.cpp',
 		'sys_dll2.cpp',
 		'sys_engine.cpp',
-		'sys_linuxwind.cpp', #[$POSIX]
 		'testscriptmgr.cpp',
 		'traceinit.cpp',
 		'../public/vallocator.cpp',
@@ -193,21 +192,34 @@ def build(bld):
 		'EngineSoundServer.cpp',
 		'audio/private/voice_wavefile.cpp',
 		'audio/private/vox.cpp',
-		'audio/private/snd_posix.cpp',	#	[$POSIX]	
-		#'audio/private/snd_dev_direct.cpp',	[$WINDOWS]/
-		#'audio/private/snd_dev_wave.cpp',	[$WINDOWS]/
-		#'audio/private/voice_mixer_controls.cpp', [$WINDOWS]	/
-		#'audio/private/voice_record_dsound.cpp',	[$WINDOWS]	/
 
 		#'audio/private/snd_dev_xaudio.cpp',[$X360]
 		#'audio/private/snd_wave_mixer_xma.cpp',	[$X360]
 
-		'audio/private/snd_dev_sdl.cpp',	#[$SDL && !$OSXALL]
 		#'audio/private/snd_dev_openal.cpp', # [$OSXALL]
 		#'audio/private/snd_dev_mac_audioqueue.cpp',#	[$OSXALL]
 		#'audio/private/voice_record_mac_audioqueue.cpp',	#[$OSXALL]
 	]
 
+	if bld.env.SDL:
+		source += [
+			'audio/private/snd_dev_sdl.cpp'		#[$SDL && !$OSXALL]
+		]
+
+	if bld.env.DEST_OS == 'win32':
+		source += [	
+			'../public/tier0/memoverride.cpp',
+			'audio/private/snd_dev_direct.cpp',
+			'audio/private/snd_dev_wave.cpp',
+			'audio/private/voice_mixer_controls.cpp',
+			'audio/private/voice_record_dsound.cpp',
+		]
+	else:
+		source += [
+			'sys_linuxwind.cpp',
+			'audio/private/snd_posix.cpp',
+		]
+
 	if bld.env.DEDICATED:
 		source += ['cl_null.cpp']
 	else:
@@ -295,8 +307,6 @@ def build(bld):
 			'audio/private/VBRHeader.cpp', #[!$X360]
 			'audio/private/voice.cpp', #[!$X360]
 			'audio/private/voice_sound_engine_interface.cpp', #[!$X360]
-			'audio/private/voice_mixer_controls_openal.cpp', #[$OSXALL||$LINUXALL]
-			'audio/private/voice_record_openal.cpp', #[$OSXALL||$LINUXALL]
 			'../public/vgui_controls/vgui_controls.cpp',
 			'../common/vgui/vgui_basebudgetpanel.cpp',
 			'../common/vgui/vgui_budgetbargraphpanel.cpp',
@@ -314,6 +324,12 @@ def build(bld):
 			'vgui_vprofpanel.cpp',	
 			'toolframework.cpp'
 		]
+		
+		if bld.env.DEST_OS != 'win32':
+			source += [	
+				'audio/private/voice_mixer_controls_openal.cpp', #[$OSXALL||$LINUXALL]
+				'audio/private/voice_record_openal.cpp' #[$OSXALL||$LINUXALL]
+			]
 
 	includes = [
 		'.',
@@ -332,7 +348,9 @@ def build(bld):
 
 	if bld.env.DEST_OS == 'android':
 		libs += ['SSL', 'CRYPTO'] # android curl was built with openssl
-
+	elif bld.env.DEST_OS == 'win32':
+		libs += ['USER32', 'WINMM', 'WININET', 'DSOUND', 'DXGUID', 'GDI32', 'bzip2']
+		
 	install_path = bld.env.LIBDIR
 
 	bld.shlib(
diff --git a/filesystem/wscript b/filesystem/wscript
index adfdd372..5a8ae946 100755
--- a/filesystem/wscript
+++ b/filesystem/wscript
@@ -28,10 +28,14 @@ def build(bld):
 		'../public/kevvaluescompiler.cpp',
 		'../public/zip_utils.cpp',
 		'QueuedLoader.cpp',
-		'linux_support.cpp', #			[$POSIX]
 		'../public/tier0/memoverride.cpp'
 	]
 
+	if bld.env.DEST_OS != 'win32':
+		source += [
+			'linux_support.cpp'
+		]
+
 	includes = [
 		'.',
 		'../public',
@@ -43,6 +47,9 @@ def build(bld):
 	defines = []
 
 	libs = ['tier0','tier1','tier2','vstdlib','vpklib']
+	
+	if bld.env.DEST_OS == 'win32':
+		libs += ['SHELL32']
 
 	install_path = bld.env.LIBDIR
 
diff --git a/game/client/wscript b/game/client/wscript
index 9b9a50e4..961dea37 100755
--- a/game/client/wscript
+++ b/game/client/wscript
@@ -66,8 +66,11 @@ def build(bld):
 	if bld.env.DEST_OS != 'android':
 		install_path += '/'+bld.env.GAMES+'/bin'
 
-	source = [ 'touch.cpp', 'arch.c' ]
-
+	source = [ 'arch.c' ]
+	if bld.env.DEST_OS == 'win32':
+		source += [ '../../public/tier0/memoverride.cpp' ]
+		libs += ['USER32']
+		
 	if bld.env.DEST_OS == 'android':
 		source += [
 			'third/minizip/mz_zip.c',
diff --git a/game/server/wscript b/game/server/wscript
index a474c2f8..03f2b24d 100755
--- a/game/server/wscript
+++ b/game/server/wscript
@@ -54,6 +54,8 @@ def build(bld):
 	defines = []
 
 	libs = ['tier0','particles','dmxloader','tier1','tier2','tier3','mathlib','vstdlib','choreoobjects','steam_api']
+	if bld.env.DEST_OS == 'win32':
+		libs += ['USER32']
 
 	install_path = bld.env.PREFIX
 	if bld.env.DEST_OS != 'android':
@@ -63,6 +65,9 @@ def build(bld):
 	includes += game["includes"]
 	defines = game["defines"]
 
+	if bld.env.DEST_OS == 'win32':
+		source += ['../../public/tier0/memoverride.cpp']
+
 	defines.remove('PROTECTED_THINGS_ENABLE')
 
 	bld.shlib(
diff --git a/gameui/wscript b/gameui/wscript
index 76473ce2..e644396d 100755
--- a/gameui/wscript
+++ b/gameui/wscript
@@ -21,7 +21,6 @@ def build(bld):
 		'BasePanel.cpp',
 		'GameConsole.cpp',
 		'GameUI_Interface.cpp',
-		# 'LogoFile.cpp', [!$POSIX]
 		'ModInfo.cpp',
 		'MouseMessageForwardingPanel.cpp',
 		'../common/GameUI/ObjectList.cpp',
@@ -66,7 +65,6 @@ def build(bld):
 		'LoadCommentaryDialog.cpp',
 		'LoadingDialog.cpp',
 		'BaseSaveGameDialog.cpp',
-		#'ChangeGameDialog.cpp', [!$POSIX]
 		'CreateMultiplayerGameBotPage.cpp',
 		'CreateMultiplayerGameDialog.cpp',
 		'CreateMultiplayerGameGameplayPage.cpp',
@@ -87,7 +85,6 @@ def build(bld):
 		'OptionsSubAudio.cpp',
 		'OptionsSubDifficulty.cpp',
 		'OptionsSubGame.cpp',
-		#'OptionsSubHaptics.cpp',	[$WIN32]	[$WIN32]
 		'OptionsSubKeyboard.cpp',
 		'OptionsSubMouse.cpp',
 		'OptionsSubMultiplayer.cpp',
@@ -96,6 +93,14 @@ def build(bld):
 		'OptionsSubVoice.cpp',
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'../public/tier0/memoverride.cpp',
+			'LogoFile.cpp',
+			'ChangeGameDialog.cpp',
+			'OptionsSubHaptics.cpp'
+		]
+
 	includes = [
 		'.',
 		'../public',
@@ -109,6 +114,9 @@ def build(bld):
 
 	libs = ['tier0','vgui_controls','tier1','tier2','tier3','vstdlib','vtf','bitmap','mathlib','SDL2','steam_api','matsys_controls','JPEG','PNG','ZLIB']
 
+	if bld.env.DEST_OS == 'win32':
+		libs += ['USER32', 'GDI32']
+		
 	install_path = bld.env.LIBDIR
 
 	bld.shlib(
diff --git a/inputsystem/wscript b/inputsystem/wscript
index cf2e8be5..814fe7e2 100755
--- a/inputsystem/wscript
+++ b/inputsystem/wscript
@@ -19,11 +19,15 @@ def build(bld):
 		'inputsystem.cpp',
 		'joystick_sdl.cpp',
 		'touch_sdl.cpp',
-		#'novint.cpp', #			[$WIN32]
 		'key_translation.cpp',
 		'steamcontroller.cpp'
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'novint.cpp'
+		]
+
 	includes = [
 		'.',
 		'../common',
@@ -35,6 +39,9 @@ def build(bld):
 
 	libs = ['tier0','tier1','tier2','vstdlib','SDL2','steam_api']
 
+	if bld.env.DEST_OS == 'win32':
+		libs += ['USER32']
+		
 	install_path = bld.env.LIBDIR
 
 	bld.shlib(
diff --git a/ivp b/ivp
index 82849306..5dc57228 160000
--- a/ivp
+++ b/ivp
@@ -1 +1 @@
-Subproject commit 82849306f728db57868d7a82fe7bcff333eb468c
+Subproject commit 5dc57228f12ac1deca3bb2d20ef3eaa290d65586
diff --git a/launcher/wscript b/launcher/wscript
index 5beb4f91..ab9e1a3f 100755
--- a/launcher/wscript
+++ b/launcher/wscript
@@ -19,9 +19,13 @@ def build(bld):
 		'../public/filesystem_init.cpp',
 		'launcher.cpp',
 		'reslistgenerator.cpp',
-		'android.cpp'
 	]
 
+	if bld.env.DEST_OS == 'android':
+		source += [
+			'android.cpp'
+		]
+
 	includes = [
 		'.',
 		'../public',
@@ -33,6 +37,9 @@ def build(bld):
 	defines = []
 
 	libs = ['tier0','tier1','tier2','tier3','vstdlib','steam_api','appframework','SDL2','togl']
+	
+	if bld.env.DEST_OS == 'win32':
+		libs += ['USER32', 'OLE32', 'SHELL32']
 
 	install_path = bld.env.LIBDIR
 
diff --git a/materialsystem/shaderapidx9/wscript b/materialsystem/shaderapidx9/wscript
index d1126bb9..6165d515 100755
--- a/materialsystem/shaderapidx9/wscript
+++ b/materialsystem/shaderapidx9/wscript
@@ -18,9 +18,13 @@ def configure(conf):
 		#'PROTECTED_THINGS_ENABLE', # conflicts with stlport
 		'strncpy=use_Q_strncpy_instead',
 		'_snprintf=use_Q_snprintf_instead',
-		'GL_GLEXT_PROTOTYPES',
-		'DX_TO_GL_ABSTRACTION'
 	])
+	
+	if conf.env.DEST_OS == 'win32' and not conf.env.GL:
+		conf.env.append_unique('DEFINES',[
+			'USE_ACTUAL_DX',
+		])
+
 
 def build(bld):
 	source = [
@@ -29,7 +33,6 @@ def build(bld):
 		'hardwareconfig.cpp',
 		'meshbase.cpp',
 		'meshdx8.cpp',
-		#'recording.cpp',								[$WIN32 && !$GL]
 		'shaderapidx8.cpp',
 		'shaderdevicebase.cpp',
 		'shaderapibase.cpp',
@@ -40,11 +43,20 @@ def build(bld):
 		'cvballoctracker.cpp',
 		'vertexdecl.cpp',
 		'vertexshaderdx8.cpp',
-		#'wmi.cpp',									[$WIN32 && !$GL]
 		#'textureheap.cpp',							[$X360]
-		'winutils.cpp'#							[!$WIN32]
 	]
 
+	if bld.env.DEST_OS == 'win32' and not bld.env.GL:
+		source += [
+			'recording.cpp',
+			'wmi.cpp'
+		]
+		
+	if bld.env.DEST_OS != 'win32':
+		source += ['winutils.cpp']
+	else:
+		source += ['../../public/tier0/memoverride.cpp']
+
 	includes = [
 		'.',
 		'../../public',
@@ -60,7 +72,9 @@ def build(bld):
 
 	if bld.env.DEST_OS == 'android':
 		libs += ['ANDROID_SUPPORT']
-
+	elif bld.env.DEST_OS == 'win32' and not bld.env.GL:
+		libs += ['D3D9', 'D3DX9', 'bzip2']
+	
 	install_path = bld.env.LIBDIR
 
 	bld.shlib(
diff --git a/materialsystem/shadersystem.cpp b/materialsystem/shadersystem.cpp
index 3a52393e..b3da33e1 100644
--- a/materialsystem/shadersystem.cpp
+++ b/materialsystem/shadersystem.cpp
@@ -447,7 +447,8 @@ extern "C"
 
 void CShaderSystem::VerifyBaseShaderDLL( CSysModule *pModule )
 {
-#if defined( _WIN32 ) && !defined( _X360 )
+//#if defined( _WIN32 ) && !defined( _X360 )
+#if 0
 	const char *pErrorStr = "Corrupt save data settings.";
 
 	unsigned char *testData1 = new unsigned char[SHADER_DLL_VERIFY_DATA_LEN1];
diff --git a/materialsystem/wscript b/materialsystem/wscript
index a99fb804..763870c1 100755
--- a/materialsystem/wscript
+++ b/materialsystem/wscript
@@ -47,6 +47,9 @@ def build(bld):
 		'ctexturecompositor.cpp'
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += ['../public/tier0/memoverride.cpp']
+
 	includes = [
 		'.',
 		'../../public',
diff --git a/public/tier0/etwprof.h b/public/tier0/etwprof.h
index c1d42822..dc9d1c39 100644
--- a/public/tier0/etwprof.h
+++ b/public/tier0/etwprof.h
@@ -27,7 +27,7 @@
 #ifdef	IS_WINDOWS_PC
 // ETW support should be compiled in for all Windows PC platforms. It isn't
 // supported on Windows XP but that is determined at run-time.
-#define	ETW_MARKS_ENABLED
+//#define	ETW_MARKS_ENABLED
 #endif
 
 #ifdef	ETW_MARKS_ENABLED
diff --git a/scripts/waifulib/compiler_optimizations.py b/scripts/waifulib/compiler_optimizations.py
index 90dbcbe5..fcfb5f6e 100644
--- a/scripts/waifulib/compiler_optimizations.py
+++ b/scripts/waifulib/compiler_optimizations.py
@@ -47,13 +47,13 @@ LINKFLAGS = {
 CFLAGS = {
 	'common': {
 		# disable thread-safe local static initialization for C++11 code, as it cause crashes on Windows XP
-		'msvc':    ['/D_USING_V110_SDK71_', '/Zi', '/FS', '/Zc:threadSafeInit-', '/MT'],
+		'msvc':    ['/D_USING_V110_SDK71_', '/Zi', '/FS', '/Zc:threadSafeInit-'],
 		'clang':   ['-g', '-gdwarf-2', '-fvisibility=hidden'],
 		'gcc':     ['-g', '-fvisibility=hidden'],
 		'owcc':	   ['-fno-short-enum', '-ffloat-store', '-g3']
 	},
 	'fast': {
-		'msvc':    ['/O2', '/Oy'],
+		'msvc':    ['/O2', '/Oy', '/MT'],
 		'gcc': {
 			'3':       ['-O3', '-fomit-frame-pointer'],
 			'default': ['-Ofast', '-funsafe-math-optimizations', '-funsafe-loop-optimizations', '-fomit-frame-pointer']
@@ -62,23 +62,23 @@ CFLAGS = {
 		'default': ['-O3']
 	},
 	'fastnative': {
-		'msvc':    ['/O2', '/Oy'],
+		'msvc':    ['/O2', '/Oy', '/MT'],
 		'gcc':     ['-Ofast', '-march=native', '-funsafe-math-optimizations', '-funsafe-loop-optimizations', '-fomit-frame-pointer'],
 		'clang':   ['-Ofast', '-march=native'],
 		'default': ['-O3']
 	},
 	'release': {
-		'msvc':    ['/O2'],
+		'msvc':    ['/O2', '/MT'],
 		'owcc':    ['-O3', '-foptimize-sibling-calls', '-fomit-leaf-frame-pointer', '-fomit-frame-pointer', '-fschedule-insns', '-funsafe-math-optimizations', '-funroll-loops', '-frerun-optimizer', '-finline-functions', '-finline-limit=512', '-fguess-branch-probability', '-fno-strict-aliasing', '-floop-optimize'],
 		'default': ['-O3']
 	},
 	'debug': {
-		'msvc':    ['/Od'],
+		'msvc':    ['/Od', '/MTd'],
 		'owcc':    ['-O0', '-fno-omit-frame-pointer', '-funwind-tables', '-fno-omit-leaf-frame-pointer'],
 		'default': ['-O0']
 	},
 	'sanitize': {
-		'msvc':    ['/Od', '/RTC1'],
+		'msvc':    ['/Od', '/RTC1', '/MT'],
 		'gcc':     ['-Og', '-fsanitize=undefined', '-fsanitize=address'],
 		'clang':   ['-O0', '-fsanitize=undefined', '-fsanitize=address'],
 		'default': ['-O0']
diff --git a/serverbrowser/wscript b/serverbrowser/wscript
index 1dc3cb8f..646b059c 100755
--- a/serverbrowser/wscript
+++ b/serverbrowser/wscript
@@ -43,6 +43,11 @@ def build(bld):
 		'../common/ServerBrowser/blacklisted_server_manager.cpp'
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'../public/tier0/memoverride.cpp'
+		]
+
 	includes = [
 		'.',
 		'../public',
diff --git a/soundemittersystem/wscript b/soundemittersystem/wscript
index 3da4b83a..b1a2ec07 100755
--- a/soundemittersystem/wscript
+++ b/soundemittersystem/wscript
@@ -24,6 +24,9 @@ def build(bld):
 		'../public/SoundParametersInternal.cpp'
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += ['../public/tier0/memoverride.cpp']
+
 	includes = [
 		'.',
 		'../public',
diff --git a/tier0/assert_dialog.rc b/tier0/assert_dialog.rc
index 19b79829..fed1133b 100644
--- a/tier0/assert_dialog.rc
+++ b/tier0/assert_dialog.rc
@@ -121,4 +121,6 @@ END
 // ETW event manifest data from ValveETWProviders.man
 //
 
+#if 0
 #include "ValveETWProviderEvents.rc"
+#endif
\ No newline at end of file
diff --git a/tier0/wscript b/tier0/wscript
index 0e9faed4..d97b94b8 100755
--- a/tier0/wscript
+++ b/tier0/wscript
@@ -18,15 +18,12 @@ def configure(conf):
 def build(bld):
 	source = [
 		'assert_dialog.cpp',
-		#'assert_dialog.rc',		[$WINDOWS]
 		'commandline.cpp',
 		'cpu.cpp',
 		'cpumonitoring.cpp',
-		'cpu_posix.cpp',			#[$POSIX]
 		'cpu_usage.cpp',
 		'dbg.cpp',
 		'dynfunction.cpp',
-		#'etwprof.cpp',			[$WINDOWS]
 		'fasttimer.cpp',
 		# 'InterlockedCompareExchange128.masm', [$WIN64]
 		'mem.cpp',
@@ -36,11 +33,7 @@ def build(bld):
 		'memvalidate.cpp',
 		'minidump.cpp',
 		'pch_tier0.cpp',
-		#'platform.cpp',		[$WINDOWS||$X360]
-		'platform_posix.cpp',	#	[$POSIX]
 		#'pmc360.cpp',		[$X360]
-		#'pme.cpp',			[$WINDOWS]
-		'pme_posix.cpp',	#	[$POSIX]
 		'PMELib.cpp',		#[$WINDOWS||$POSIX]
 		'progressbar.cpp',
 		'security.cpp',
@@ -50,12 +43,26 @@ def build(bld):
 		'threadtools.cpp',
 		'tier0_strtools.cpp',
 		'tslist.cpp',
-		#'vcrmode.cpp',		#[$WINDOWS]
-		'vcrmode_posix.cpp',	#[$POSIX]
 		'vprof.cpp',
-		# 'win32consoleio.cpp',	[$WINDOWS]
 		#'../tier1/pathmatch.cpp' # [$LINUXALL]
 	]
+	
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'assert_dialog.rc',
+			#'etwprof.cpp',			[$WINDOWS]
+			'platform.cpp',
+			'pme.cpp',
+			'vcrmode.cpp',
+			'win32consoleio.cpp'
+		]
+	else:
+		source += [
+			'cpu_posix.cpp',
+			'platform_posix.cpp',
+			'pme_posix.cpp',
+			'vcrmode_posix.cpp'
+		]
 
 	includes = [
 		'.',
@@ -65,7 +72,10 @@ def build(bld):
 
 	defines = []
 
-	libs = ['DL', 'M', 'LOG']
+	if bld.env.DEST_OS == 'win32':
+		libs = ['ADVAPI32', 'WS2_32']
+	else:
+		libs = ['DL', 'M', 'LOG']
 
 	install_path = bld.env.LIBDIR
 
diff --git a/tier1/wscript b/tier1/wscript
index 80a32f69..6009e7f0 100755
--- a/tier1/wscript
+++ b/tier1/wscript
@@ -40,10 +40,6 @@ def build(bld):
 		'memstack.cpp',
 		'NetAdr.cpp',
 		'newbitbuf.cpp',
-#		'pathmatch.cpp', # [$LINUXALL]
-		# 'processor_detect.cpp', # [$WINDOWS||$X360]
-		'processor_detect_linux.cpp', # [$POSIX]
-		'qsort_s.cpp', # [$LINUXALL||$PS3]
 		'rangecheckedvar.cpp',
 		'reliabletimer.cpp',
 		'snappy-sinksource.cpp',
@@ -64,6 +60,17 @@ def build(bld):
 		'utlsymbol.cpp'
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'processor_detect.cpp',
+		]
+	else:
+		source += [
+			#'pathmatch.cpp',
+			'processor_detect_linux.cpp',
+			'qsort_s.cpp',
+		]
+
 	includes = [
 		'.',
 		'../public',
@@ -75,7 +82,9 @@ def build(bld):
 	defines = []
 
 	libs = []
-
+	if bld.env.DEST_OS == 'win32':
+		libs += ['RPCRT4']
+		
 	bld.stlib(
 		source   = source,
 		target   = PROJECT_NAME,
diff --git a/utils/bzip2/wscript b/utils/bzip2/wscript
index 92b9c0a8..70f11909 100755
--- a/utils/bzip2/wscript
+++ b/utils/bzip2/wscript
@@ -12,8 +12,8 @@ def options(opt):
 	return
 
 def configure(conf):
-	conf.env.append_unique('CFLAGS',['-std=gnu11'])
-
+	if conf.env.DEST_OS != 'win32':
+		conf.env.append_unique('CFLAGS',['-std=gnu11'])
 
 def build(bld):
 	source = [
@@ -39,8 +39,6 @@ def build(bld):
 
 	libs = []
 
-	install_path = bld.env.PREFIX
-
 	bld.stlib(
 		source   = source,
 		target   = PROJECT_NAME,
@@ -49,7 +47,6 @@ def build(bld):
 		includes = includes,
 		defines  = defines,
 		use      = libs,
-		install_path = install_path,
 		subsystem = bld.env.MSVC_SUBSYSTEM,
 		idx      = bld.get_taskgen_count()
 	)
diff --git a/vgui2/src/wscript b/vgui2/src/wscript
index f4e5547c..ad76f5a2 100644
--- a/vgui2/src/wscript
+++ b/vgui2/src/wscript
@@ -28,9 +28,6 @@ def build(bld):
 		'MemoryBitmap.cpp',
 		'MessageListener.cpp',
 		'Scheme.cpp',
-		#'Surface.cpp',					[$WIN32]
-		#'System.cpp',					[$WINDOWS||$X360]
-		'system_posix.cpp',# [$POSIX]
 		'../../public/UnicodeFileHelpers.cpp',
 		'vgui.cpp',
 		'vgui_internal.cpp',
@@ -40,6 +37,17 @@ def build(bld):
 		'keyrepeat.cpp'
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'Surface.cpp',
+			'System.cpp',
+			'../../public/tier0/memoverride.cpp'
+		]
+	else:
+		source += [
+			'system_posix.cpp'
+		]
+		
 	includes = [
 		'.',
 		'../../public',
@@ -52,6 +60,9 @@ def build(bld):
 
 	libs = ['tier0','tier1','tier2','tier3','vstdlib','SDL2']
 
+	if bld.env.DEST_OS == 'win32':
+		libs += ['USER32', 'IMM32', 'GDI32', 'SHELL32', 'OLE32', 'SHLWAPI', 'vgui_surfacelib', 'WINMM']
+		
 	install_path = bld.env.LIBDIR
 
 	bld.shlib(
diff --git a/vgui2/vgui_controls/wscript b/vgui2/vgui_controls/wscript
index 4962d364..68644dc0 100644
--- a/vgui2/vgui_controls/wscript
+++ b/vgui2/vgui_controls/wscript
@@ -106,6 +106,9 @@ def build(bld):
 
 	libs = []
 
+	if bld.env.DEST_OS == 'win32':
+		libs += ['SHELL32']
+
 	bld.stlib(
 		source   = source,
 		target   = PROJECT_NAME,
diff --git a/vgui2/vgui_surfacelib/wscript b/vgui2/vgui_surfacelib/wscript
index 0de65a46..d93032bf 100644
--- a/vgui2/vgui_surfacelib/wscript
+++ b/vgui2/vgui_surfacelib/wscript
@@ -20,11 +20,18 @@ def build(bld):
 		'FontAmalgam.cpp',
 		'FontManager.cpp',
 		'FontEffects.cpp',
-		#'Win32Font.cpp',			[$WIN32 && !$X360]
 		#'Win32Font_x360.cpp',	[$X360]
 		#'osxfont.cpp',			[$OSXALL]
-		'linuxfont.cpp'	#		[$LINUXALL]
 	]
+	
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'Win32Font.cpp'
+		]
+	else:
+		source += [
+			'linuxfont.cpp'
+		]
 
 	includes = [
 		'.',
diff --git a/vguimatsurface/wscript b/vguimatsurface/wscript
index 7359a3ab..db0f3d05 100644
--- a/vguimatsurface/wscript
+++ b/vguimatsurface/wscript
@@ -27,12 +27,17 @@ def build(bld):
 		'Input.cpp',
 		'MatSystemSurface.cpp',
 		'asanstubs.cpp',
-		#'memorybitmap.cpp',						[$WIN32]
 		'TextureDictionary.cpp',
 		'../vgui2/src/vgui_key_translation.cpp',
 		'../public/vgui_controls/vgui_controls.cpp'
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'../public/tier0/memoverride.cpp',
+			'memorybitmap.cpp'
+		]
+
 	includes = [
 		'.',
 		'../public',
@@ -47,6 +52,8 @@ def build(bld):
 
 	if bld.env.DEST_OS == 'android':
 		libs += ['EXPAT']
+	elif bld.env.DEST_OS == 'win32':
+		libs += ['USER32', 'GDI32']
 
 	install_path = bld.env.LIBDIR
 
diff --git a/video/wscript b/video/wscript
index 30d7a560..b30df1ad 100755
--- a/video/wscript
+++ b/video/wscript
@@ -31,6 +31,9 @@ def build(bld):
 
 	libs = ['tier0','tier1','tier2','tier3','vstdlib']
 
+	if bld.env.DEST_OS == 'win32':
+		libs += ['USER32']
+
 	install_path = bld.env.LIBDIR
 
 	bld.shlib(
diff --git a/vstdlib/wscript b/vstdlib/wscript
index 3e2547af..0ed048e8 100755
--- a/vstdlib/wscript
+++ b/vstdlib/wscript
@@ -22,11 +22,15 @@ def build(bld):
 		'jobthread.cpp',
 		'KeyValuesSystem.cpp',
 		'osversion.cpp',
-		#'processutils.cpp'	#		[$WINDOWS]
 		'random.cpp',
 		'vcover.cpp',
 		'../public/tier0/memoverride.cpp'
 	]
+	
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			'processutils.cpp'
+		]
 
 	includes = [
 		'.',
diff --git a/vtf/wscript b/vtf/wscript
index 3698d0c4..ed49385b 100755
--- a/vtf/wscript
+++ b/vtf/wscript
@@ -17,11 +17,15 @@ def configure(conf):
 def build(bld):
 	source = [
 		'convert_x360.cpp',
-		#$File	"s3tc_decode.cpp" #	[$WINDOWS]
 		'vtf.cpp'
 		#$File	"vtf_x360.cpp"#		[$X360]
 	]
 
+	if bld.env.DEST_OS == 'win32':
+		source += [
+			's3tc_decode.cpp'
+		]
+
 	includes = [
 		'.',
 		'../public',
diff --git a/wscript b/wscript
index 05681f75..c0daf0e0 100644
--- a/wscript
+++ b/wscript
@@ -153,7 +153,6 @@ def define_platform(conf):
 	if conf.options.TOGLES:
 		conf.env.append_unique('DEFINES', ['TOGLES'])
 
-
 	if conf.options.SDL:
 		conf.define('USE_SDL', 1)
 
@@ -166,8 +165,7 @@ def define_platform(conf):
 			'NO_HOOK_MALLOC',
 			'_DLL_EXT=.so'
 		])
-
-	if conf.env.DEST_OS == 'android':
+	elif conf.env.DEST_OS == 'android':
 		conf.env.append_unique('DEFINES', [
 			'ANDROID=1', '_ANDROID=1',
 			'LINUX=1', '_LINUX=1',
@@ -176,8 +174,20 @@ def define_platform(conf):
 			'NO_HOOK_MALLOC',
 			'_DLL_EXT=.so'
 		])
+	elif conf.env.DEST_OS == 'win32':
+		conf.env.append_unique('DEFINES', [
+			'WIN32=1', '_WIN32=1',
+			'_WINDOWS',
+			'_DLL_EXT=.dll',
+			'_CRT_SECURE_NO_DEPRECATE',
+			'_CRT_NONSTDC_NO_DEPRECATE',
+			'_ALLOW_RUNTIME_LIBRARY_MISMATCH',
+			'_ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH',
+			'_ALLOW_MSC_VER_MISMATCH',
+			'NO_X360_XDK'
+		])
 
-	if conf.options.DEBUG_ENGINE:
+	if conf.options.DEBUG_ENGINE or conf.options.BUILD_TYPE == 'debug':
 		conf.env.append_unique('DEFINES', [
 			'DEBUG', '_DEBUG'
 		])
@@ -198,10 +208,10 @@ def options(opt):
 	grp.add_option('-D', '--debug-engine', action = 'store_true', dest = 'DEBUG_ENGINE', default = False,
 		help = 'build with -DDEBUG [default: %default]')
 
-	grp.add_option('--use-sdl', action = 'store', dest = 'SDL', type = 'int', default = True,
+	grp.add_option('--use-sdl', action = 'store', dest = 'SDL', type = 'int', default = sys.platform != 'win32',
 		help = 'build engine with SDL [default: %default]')
 
-	grp.add_option('--use-togl', action = 'store', dest = 'GL', type = 'int', default = True,
+	grp.add_option('--use-togl', action = 'store', dest = 'GL', type = 'int', default = sys.platform != 'win32',
 		help = 'build engine with ToGL [default: %default]')
 
 	grp.add_option('--build-games', action = 'store', dest = 'GAMES', type = 'string', default = 'hl2',
@@ -223,7 +233,7 @@ def options(opt):
 	opt.load('reconfigure')
 
 def configure(conf):
-	conf.load('fwgslib reconfigure')
+	conf.load('fwgslib reconfigure compiler_optimizations')
 
 	# Force XP compability, all build targets should add
 	# subsystem=bld.env.MSVC_SUBSYSTEM
@@ -231,7 +241,7 @@ def configure(conf):
 	conf.env.MSVC_SUBSYSTEM = 'WINDOWS,5.01'
 	conf.env.MSVC_TARGETS = ['x86'] # explicitly request x86 target for MSVC
 	if sys.platform == 'win32':
-		conf.load('msvc msvc_pdb msdev msvs')
+		conf.load('msvc_pdb msdev msvs')
 	conf.load('subproject xcompile compiler_c compiler_cxx gitversion clang_compilation_database strip_on_install waf_unit_test enforce_pic')
 
 	define_platform(conf)
@@ -241,6 +251,9 @@ def configure(conf):
 	elif conf.env.GL:
 		projects['game'] += ['togl']
 
+	if conf.env.DEST_OS == 'win32':
+		projects['game'] += ['utils/bzip2']
+		projects['dedicated'] += ['utils/bzip2']
 
 	if conf.env.DEST_OS in ['win32', 'linux', 'darwin'] and conf.env.DEST_CPU == 'x86_64':
 		conf.env.BIT32_MANDATORY = not conf.options.ALLOW64
@@ -269,7 +282,8 @@ def configure(conf):
 
 	cflags, linkflags = conf.get_optimization_flags()
 
-	flags = ['-fPIC']
+	if conf.env.DEST_OS != 'win32':
+		flags = ['-fPIC']
 
 	if conf.env.DEST_OS == 'android':
 		flags += [
@@ -289,15 +303,51 @@ def configure(conf):
 			flags += ['-mcpu=cortex-a15', '-mtune=cortex-a15']
 		else:
 			flags += ['-march=native', '-mtune=native']
-	else:
+	elif conf.env.COMPILER_GCC:
 		flags += ['-march=native','-mtune=native','-mfpmath=sse', '-msse', '-msse2']
 
 
-	cflags += flags
-	linkflags += flags
+	if conf.env.DEST_OS != 'win32':
+		cflags += flags
+		linkflags += flags
+	else:
+		cflags += [
+			'/I'+os.path.abspath('.')+'/thirdparty/SDL',
+			'/arch:SSE',
+			'/GF',
+			'/Gy',
+			'/fp:fast',
+			'/Zc:forScope',
+			'/Zc:wchar_t',
+			'/GR',
+			'/TP'
+		]
+		
+		if conf.options.BUILD_TYPE == 'debug':
+			linkflags += [
+				'/INCREMENTAL:NO',
+				'/NODEFAULTLIB:libc',
+				'/NODEFAULTLIB:libcd',
+				'/NODEFAULTLIB:libcmt'
+			]
+		else:
+			linkflags += [
+				'/INCREMENTAL',
+				'/NODEFAULTLIB:libc',
+				'/NODEFAULTLIB:libcd',
+				'/NODEFAULTLIB:libcmtd'
+			]
 
+		linkflags += [
+			'/LIBPATH:'+os.path.abspath('.')+'/lib/public',
+			'/LIBPATH:'+os.path.abspath('.')+'/lib/common/win32/2015/release',
+			'/LIBPATH:'+os.path.abspath('.')+'/dx9sdk/lib'
+		]
+		
 	# And here C++ flags starts to be treated separately
-	cxxflags = list(cflags) + ['-std=c++11','-fpermissive']
+	cxxflags = list(cflags) 
+	if conf.env.DEST_OS != 'win32':
+		cxxflags += ['-std=c++11','-fpermissive']
 
 	if conf.env.COMPILER_CC == 'gcc':
 #		wrapfunctions = ['freopen','creat','access','__xstat','stat','lstat','fopen64','open64',
@@ -306,10 +356,13 @@ def configure(conf):
 
 #		for func in wrapfunctions:
 #			linkflags += ['-Wl,--wrap='+func]
-
-
 		conf.define('COMPILER_GCC', 1)
-
+	elif conf.env.COMPILER_CC == 'msvc':
+		conf.define('COMPILER_MSVC', 1)
+		if conf.env.DEST_CPU == 'x86':
+			conf.define('COMPILER_MSVC32', 1)
+		elif conf.env.DEST_CPU == 'x86_64':
+			conf.define('COMPILER_MSVC64', 1)
 
 	if conf.env.COMPILER_CC != 'msvc':
 		conf.check_cc(cflags=cflags, linkflags=linkflags, msg='Checking for required C flags')
@@ -328,7 +381,59 @@ def configure(conf):
 	conf.env.append_unique('LINKFLAGS', linkflags)
 	conf.env.append_unique('INCLUDES', [os.path.abspath('common/')])
 
-	if conf.env.DEST_OS != 'android':
+	if conf.env.DEST_OS == 'android':
+		conf.check(lib='SDL2', uselib_store='SDL2')
+		conf.check(lib='freetype2', uselib_store='FT2')
+		conf.check(lib='openal', uselib_store='OPENAL')
+		conf.check(lib='jpeg', uselib_store='JPEG')
+		conf.check(lib='png', uselib_store='PNG')
+		conf.check(lib='curl', uselib_store='CURL')
+		conf.check(lib='z', uselib_store='ZLIB')
+		conf.check(lib='crypto', uselib_store='CRYPTO')
+		conf.check(lib='ssl', uselib_store='SSL')
+		conf.check(lib='expat', uselib_store='EXPAT')
+		conf.check(lib='android_support', uselib_store='ANDROID_SUPPORT')
+	elif conf.env.DEST_OS == 'win32':
+		# Common Win32 libraries
+		# Don't check them more than once, to save time
+		# Usually, they are always available
+		# but we need them in uselib
+		a = [
+			'user32',
+			'shell32',
+			'gdi32',
+			'advapi32',
+			'dbghelp',
+			'psapi',
+			'ws2_32',
+			'rpcrt4',
+			'winmm',
+			'wininet',
+			'ole32',
+			'shlwapi',
+			'imm32'
+		]
+
+		if conf.env.COMPILER_CC == 'msvc':
+			for i in a:
+				conf.start_msg('Checking for MSVC library')
+				conf.check_lib_msvc(i)
+				conf.end_msg(i)
+		else:
+			for i in a:
+				conf.check_cc(lib = i)
+
+		conf.check(lib='libz', uselib_store='ZLIB')
+		conf.check(lib='nvtc', uselib_store='NVTC')
+		conf.check(lib='ati_compress_mt_vc10', uselib_store='ATI_COMPRESS_MT_VC10')
+		conf.check(lib='SDL2', uselib_store='SDL2')
+		conf.check(lib='libjpeg', uselib_store='JPEG')
+		conf.check(lib='libpng', uselib_store='PNG')
+		conf.check(lib='d3dx9', uselib_store='D3DX9')
+		conf.check(lib='d3d9', uselib_store='D3D9')
+		conf.check(lib='dsound', uselib_store='DSOUND')
+		conf.check(lib='dxguid', uselib_store='DXGUID')
+	else:
 		if conf.options.SDL:
 			conf.check_cfg(package='sdl2', uselib_store='SDL2', args=['--cflags', '--libs'])
 		if conf.options.DEDICATED:
@@ -341,18 +446,6 @@ def configure(conf):
 			conf.check_cfg(package='libpng', uselib_store='PNG', args=['--cflags', '--libs'])
 			conf.check_cfg(package='libcurl', uselib_store='CURL', args=['--cflags', '--libs'])
 		conf.check_cfg(package='zlib', uselib_store='ZLIB', args=['--cflags', '--libs'])
-	else:
-		conf.check(lib='SDL2', uselib_store='SDL2')
-		conf.check(lib='freetype2', uselib_store='FT2')
-		conf.check(lib='openal', uselib_store='OPENAL')
-		conf.check(lib='jpeg', uselib_store='JPEG')
-		conf.check(lib='png', uselib_store='PNG')
-		conf.check(lib='curl', uselib_store='CURL')
-		conf.check(lib='z', uselib_store='ZLIB')
-		conf.check(lib='crypto', uselib_store='CRYPTO')
-		conf.check(lib='ssl', uselib_store='SSL')
-		conf.check(lib='expat', uselib_store='EXPAT')
-		conf.check(lib='android_support', uselib_store='ANDROID_SUPPORT')
 
 	if conf.env.DEST_OS != 'win32':
 		conf.check_cc(lib='dl', mandatory=False)
@@ -361,31 +454,6 @@ def configure(conf):
 
 		if not conf.env.LIB_M: # HACK: already added in xcompile!
 			conf.check_cc(lib='m')
-	else:
-		# Common Win32 libraries
-		# Don't check them more than once, to save time
-		# Usually, they are always available
-		# but we need them in uselib
-		a = map(lambda x: {
-			# 'features': 'c',
-			# 'message': '...' + x,
-			'lib': x,
-			# 'uselib_store': x.upper(),
-			# 'global_define': False,
-		}, [
-			'user32',
-			'shell32',
-			'gdi32',
-			'advapi32',
-			'dbghelp',
-			'psapi',
-			'ws2_32'
-		])
-
-		for i in a:
-			conf.check_cc(**i)
-
-		# conf.multicheck(*a, run_all_tests = True, mandatory = True)
 
 	# indicate if we are packaging for Linux/BSD
 	if conf.env.DEST_OS != 'android':
@@ -407,6 +475,10 @@ def configure(conf):
 def build(bld):
 	os.environ["CCACHE_DIR"] = os.path.abspath('.ccache/'+bld.env.COMPILER_CC+'/'+bld.env.DEST_OS+'/'+bld.env.DEST_CPU)
 
+	if bld.env.DEST_OS == 'win32':
+		projects['game'] += ['utils/bzip2']
+		projects['dedicated'] += ['utils/bzip2']
+
 	if bld.env.DEDICATED:
 		bld.add_subproject(projects['dedicated'])
 	else: