After a long YM discution with a fellow countryman we agreed that there is an issue between Total Commander and BSplayer:
When opening a video file from inside TC, BSPlayer crashes with an error message: 00485CEF, read of adress 00000034.
Tested with ffdshow, DivX decoder, XviD decoder, DMO decoder, same behaviour
Tested with window's avi splitter and also with Haali
Re-registered quartz.dll
Thumbnail mode disabled in TC
Same file opened from Explorer plays fine without problems.
Could this be related to open/play commands that BSplayer uses ?