Index: /trunk/src/VBox/Additions/WINNT/Graphics/Miniport/wddm/VBoxVideoWddm.cpp
===================================================================
--- /trunk/src/VBox/Additions/WINNT/Graphics/Miniport/wddm/VBoxVideoWddm.cpp	(revision 27550)
+++ /trunk/src/VBox/Additions/WINNT/Graphics/Miniport/wddm/VBoxVideoWddm.cpp	(revision 27551)
@@ -397,5 +397,5 @@
             {
                 if (pInfo->RedMask == 0xFF0000 && pInfo->GreenMask == 0xFF00 && pInfo->BlueMask == 0xFF)
-                    return D3DDDIFMT_X8R8G8B8;
+                    return D3DDDIFMT_A8R8G8B8;
                 drprintf((__FUNCTION__": unsupported format: bpp(%d), rmask(%d), gmask(%d), bmask(%d)\n", pInfo->BitsPerPlane, pInfo->RedMask, pInfo->GreenMask, pInfo->BlueMask));
                 AssertBreakpoint();