[Bug 39305] Sanitarium doesn't display the game surface

https://bugs.winehq.org/show_bug.cgi?id=39305

--- Comment #2 from paulo  ---

Combining the previous workaround of using gdi for the mouse problem still
works. Use these on the prefix you're running the game on:

wine reg add "HKCU\Software\Wine\Direct3D" /v "OffscreenRenderingMode" /t
REG_SZ /d "backbuffer"
wine reg add "HKCU\Software\Wine\Direct3D" /v "DirectDrawRenderer" /t REG_SZ
/d "gdi"

and you'll have native fullscreen with a image without the mouse problem... i
think. Didn't test extensively.