Index: boot/bootdata/hivecls.inf
===================================================================
--- boot/bootdata/hivecls.inf	(revision 67197)
+++ boot/bootdata/hivecls.inf	(working copy)
@@ -266,6 +266,18 @@
 HKCR,"sysfile","FriendlyTypeName",0x00020000,"@%SystemRoot%\system32\shell32.dll,-171"
 HKCR,"sysfile\DefaultIcon","",0x00020000,"%SystemRoot%\system32\shell32.dll,-154"
 
+; MS Styles (Themes)
+HKCR,".msstyles","",0x00000000,"msstylesfile"
+HKCR,"msstylesfile","",0x00000000,"Visual Style File"
+HKCR,"msstylesfile\DefaultIcon","","0x00020000","%SystemRoot%\system32\themeui.dll,-1"
+HKCR,"msstylesfile\shell\open\command","",0x00000000,"%SystemRoot%\system32\rundll32.exe shell32.dll,Control_RunDLL %SystemRoot%\system32\desk.cpl desk,@Appearance /Action:OpenMSTheme file:""%1"""
+
+; Theme File
+HKCR,".theme","",0x00000000,"themefile"
+HKCR,"themefile","",0x00000000,"Theme File"
+HKCR,"themefile\DefaultIcon","","0x00020000","%SystemRoot%\system32\themeui.dll,-1"
+HKCR,"themefile\shell\open\command","",0x00000000,"%SystemRoot%\system32\rundll32.exe shell32.dll,Control_RunDLL %SystemRoot%\system32\desk.cpl desk,@Appearance /Action:OpenTheme /file:""%1"""
+
 ; URL shortcuts (e.g. used in favorites folder of IExplorer)
 HKCR,".url","",0x00000000,"InternetShortcut"
 
Index: dll/win32/CMakeLists.txt
===================================================================
--- dll/win32/CMakeLists.txt	(revision 67197)
+++ dll/win32/CMakeLists.txt	(working copy)
@@ -203,6 +203,7 @@
 add_subdirectory(t2embed)
 add_subdirectory(tapi32)
 add_subdirectory(tapiui)
+add_subdirectory(themeui)
 add_subdirectory(traffic)
 add_subdirectory(twain_32)
 add_subdirectory(uext2)
Index: dll/win32/themeui/CMakeLists.txt
===================================================================
--- dll/win32/themeui/CMakeLists.txt	(revision 0)
+++ dll/win32/themeui/CMakeLists.txt	(working copy)
@@ -0,0 +1,5 @@
+	
+add_library(themeui SHARED themeui.rc)
+set_module_type(themeui win32dll ENTRYPOINT 0)
+
+add_cd_file(TARGET themeui DESTINATION reactos/system32 FOR all)
\ No newline at end of file
Index: dll/win32/themeui/themeui.rc
===================================================================
--- dll/win32/themeui/themeui.rc	(revision 0)
+++ dll/win32/themeui/themeui.rc	(working copy)
@@ -0,0 +1,7 @@
+#define REACTOS_VERSION_DLL
+#define REACTOS_STR_FILE_DESCRIPTION	"Theme UI Library\0"
+#define REACTOS_STR_INTERNAL_NAME	"themeui\0"
+#define REACTOS_STR_ORIGINAL_FILENAME	"themeui.dll\0"
+#include <reactos/version.rc>
+
+1 ICON "themeui.ico"
\ No newline at end of file
Index: dll/win32/themeui/CMakeLists.txt
===================================================================
--- dll/win32/themeui/CMakeLists.txt	(revision 0)
+++ dll/win32/themeui/CMakeLists.txt	(working copy)
@@ -0,0 +1,5 @@
+	
+add_library(themeui SHARED themeui.rc)
+set_module_type(themeui win32dll ENTRYPOINT 0)
+
+add_cd_file(TARGET themeui DESTINATION reactos/system32 FOR all)
\ No newline at end of file
Index: dll/win32/themeui/themeui.rc
===================================================================
--- dll/win32/themeui/themeui.rc	(revision 0)
+++ dll/win32/themeui/themeui.rc	(working copy)
@@ -0,0 +1,7 @@
+#define REACTOS_VERSION_DLL
+#define REACTOS_STR_FILE_DESCRIPTION	"Theme UI Library\0"
+#define REACTOS_STR_INTERNAL_NAME	"themeui\0"
+#define REACTOS_STR_ORIGINAL_FILENAME	"themeui.dll\0"
+#include <reactos/version.rc>
+
+1 ICON "themeui.ico"
\ No newline at end of file