Vista&7 use a different msstyles format that is not supported. I think transparency shouldn't be a problem, a) because Vista/7 themes themselves contain an opaque version (the bright blue one) + the transparent version can be set to opacity 100%. b) Even now Wine does not draw window frames and titles when you use a XP theme. Drawing window frames is a job of the default window manager and not Wine (not yet to speak of inconsistent behaviour for shortcuts, window buttons etc.) Normally Windows themes don't contain transparent elements inside of the window frames (many pngs, but they don't let the desktop penetrate). Nevertheless proper RGBA and compositing support would be good. I also agree that it's time to increase support for current Windows and Vista&7 themes because they are now around for so long and Microsoft advances so fast.
