[Bug 15934] Can't see Worms 2 intro films as they play

http://bugs.winehq.org/show_bug.cgi?id=15934

--- Comment #10 from Bruno Jesus  2013-02-20 18:10:30 CST ---
Created attachment 43661
  --> http://bugs.winehq.org/attachment.cgi?id=43661
hack to make movies play

After talking to Jörg I started looking for the code that actually paints the
video frames in the screen because there is nothing wrong with the video
decoding. I was lucky enough that the function is called MCIAVI_PaintFrame. So
I hacked the hDC that is used and now the movie is played in the desktop, over
everything (but with very weird colors) - see the patch.

Question:
What could happen for the hDC used by Worms to no show? It's non-zero for sure. 
How can I tell if it's valid?