diff --git a/win32/deps/atk/build/win32/vc10/atk.sln b/win32/deps/atk/build/win32/vc10/atk.sln
index e49f4ae6..55d55313 100644
--- a/win32/deps/atk/build/win32/vc10/atk.sln
+++ b/win32/deps/atk/build/win32/vc10/atk.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "atk", "atk.vcxproj", "{86EACD59-F69F-4AAD-854B-AA03D5447360}"
 EndProject
diff --git a/win32/deps/cairo/cairo.sln b/win32/deps/cairo/cairo.sln
index d5cf34cc..deaa4228 100644
--- a/win32/deps/cairo/cairo.sln
+++ b/win32/deps/cairo/cairo.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "cairo", "cairo.vcxproj", "{E82F3508-C849-4D33-86AF-13300224A169}"
 EndProject
diff --git a/win32/deps/expat/expat.sln b/win32/deps/expat/expat.sln
index 0b896446..2b7f5c0e 100644
--- a/win32/deps/expat/expat.sln
+++ b/win32/deps/expat/expat.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "elements", "examples\elements.vcxproj", "{B6BF0EDA-DE70-4E24-B60B-155F4B2EEBEB}"
 EndProject
diff --git a/win32/deps/fontconfig/fontconfig.sln b/win32/deps/fontconfig/fontconfig.sln
index 0a56fb73..b87e97ca 100644
--- a/win32/deps/fontconfig/fontconfig.sln
+++ b/win32/deps/fontconfig/fontconfig.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fontconfig", "fontconfig.vcxproj", "{E82C60A1-5613-4DB5-B965-5F1E11CB68BD}"
 EndProject
diff --git a/win32/deps/freetype/builds/win32/vc10/freetype.sln b/win32/deps/freetype/builds/win32/vc10/freetype.sln
index 42608fc9..5c7c1378 100644
--- a/win32/deps/freetype/builds/win32/vc10/freetype.sln
+++ b/win32/deps/freetype/builds/win32/vc10/freetype.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "freetype", "freetype.vcxproj", "{78B079BD-9FC7-4B9E-B4A6-96DA0F00248B}"
 EndProject
diff --git a/win32/deps/gdk-pixbuf/build/win32/vc10/gdk-pixbuf.sln b/win32/deps/gdk-pixbuf/build/win32/vc10/gdk-pixbuf.sln
index 29885d90..26d2d2e5 100644
--- a/win32/deps/gdk-pixbuf/build/win32/vc10/gdk-pixbuf.sln
+++ b/win32/deps/gdk-pixbuf/build/win32/vc10/gdk-pixbuf.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "gdk-pixbuf", "gdk-pixbuf.vcxproj", "{01ADE22D-F6EC-4D09-8FE1-B9A97DEC2BA3}"
 EndProject
diff --git a/win32/deps/glib/build/win32/vc10/glib.sln b/win32/deps/glib/build/win32/vc10/glib.sln
index c93807c2..a33bac4f 100644
--- a/win32/deps/glib/build/win32/vc10/glib.sln
+++ b/win32/deps/glib/build/win32/vc10/glib.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "glib", "glib.vcxproj", "{12BCA020-EABF-429E-876A-A476BC9C10C0}"
 EndProject
diff --git a/win32/deps/gtk/build/win32/vc10/gtk+.sln b/win32/deps/gtk/build/win32/vc10/gtk+.sln
index eff67af8..1525863d 100644
--- a/win32/deps/gtk/build/win32/vc10/gtk+.sln
+++ b/win32/deps/gtk/build/win32/vc10/gtk+.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "gdk-win32", "gdk-win32.vcxproj", "{FC5AADB5-95CD-4BF0-BA8B-0C16FE7073FA}"
 EndProject
diff --git a/win32/deps/libpng/projects/vstudio/vstudio.sln b/win32/deps/libpng/projects/vstudio/vstudio.sln
index cd6d4a6b..8c777b26 100644
--- a/win32/deps/libpng/projects/vstudio/vstudio.sln
+++ b/win32/deps/libpng/projects/vstudio/vstudio.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libpng", "libpng\libpng.vcxproj", "{D6973076-9317-4EF2-A0B8-B7A18AC0713E}"
 	ProjectSection(ProjectDependencies) = postProject
diff --git a/win32/deps/libxml2/win32/VC10/libxml2.sln b/win32/deps/libxml2/win32/VC10/libxml2.sln
index 6fef94b9..9cfdae06 100644
--- a/win32/deps/libxml2/win32/VC10/libxml2.sln
+++ b/win32/deps/libxml2/win32/VC10/libxml2.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libxml2", "libxml2.vcxproj", "{1D6039F6-5078-416F-A3AF-A36EFC7E6A1C}"
 EndProject
diff --git a/win32/deps/pango/build/win32/vc10/pango.sln b/win32/deps/pango/build/win32/vc10/pango.sln
index 13cdd44a..64119f16 100644
--- a/win32/deps/pango/build/win32/vc10/pango.sln
+++ b/win32/deps/pango/build/win32/vc10/pango.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pango", "pango.vcxproj", "{68CC80B9-7225-4FB5-B9AB-9C1DF50B6C72}"
 EndProject
diff --git a/win32/deps/pixman/build/win32/vc10/pixman.sln b/win32/deps/pixman/build/win32/vc10/pixman.sln
index b795e16a..f00822d1 100644
--- a/win32/deps/pixman/build/win32/vc10/pixman.sln
+++ b/win32/deps/pixman/build/win32/vc10/pixman.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pixman", "pixman.vcxproj", "{65E6ECB5-BA49-4C52-A085-1E3BB18836D0}"
 EndProject
diff --git a/win32/hexchat-xp.sln b/win32/hexchat-xp.sln
index f4f73d3c..d48742e2 100644
--- a/win32/hexchat-xp.sln
+++ b/win32/hexchat-xp.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "common", "..\src\common\common-xp.vcxproj", "{87554B59-006C-4D94-9714-897B27067BA3}"
 EndProject
diff --git a/win32/hexchat.sln b/win32/hexchat.sln
index 1060a379..3eefc243 100644
--- a/win32/hexchat.sln
+++ b/win32/hexchat.sln
@@ -1,5 +1,5 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "common", "..\src\common\common.vcxproj", "{87554B59-006C-4D94-9714-897B27067BA3}"
 EndProject