http://bugs.winehq.org/show_bug.cgi?id=201
--- Comment #95 from Sergio Callegari scallegari@arces.unibo.it 2011-10-22 09:33:14 CDT --- This is still an issue in wine 1.3.31 for background of bitmaps.
As a test
1) Download LTSPICEIV (this is a free application, so that anybody can test it) 2) Start the application 3) Select new schematic 4) In simulation menu select simulation control panel
A window appears with many tabs. Each tab has its own little icon. The background of the icons should be transparent, but it is in fact black in wine.
I think I got here since a very old bug I reported got marked as a duplicate of this one. Please either reopen this bug or let me know if I should open a new bug.