https://bugs.winehq.org/show_bug.cgi?id=26898
roger@mailinator.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |roger@mailinator.com
--- Comment #15 from roger@mailinator.com --- "Screenshots are saved in dds format. When saving game, I get the following in console fixme:d3d_surface:surface_convert_format Cannot find a conversion function from format WINED3DFMT_B8G8R8A8_UNORM to WINED3DFMT_DXT1. Saved screenshot is completely black."
If this is really the issue don't expect this to be fixed anytime soon. For legal reasons they cant add the support in wine.