OK... What am I doing wrong?
Both Autorun.bmp and Autorun.png are same in size.
PNG is 32b while BMP is 2b (just like originals in CIU that was supplied).
Sizes are the same on both images 800x587 and that same size is set in Setup.ini.
Code:
[AutorunSettings]
AutorunWidth=587
AutorunHeight=800