Check out skin.ini file (e.g. in Notepad) of Base-skin (folder "Base" in "Skins" folder); all information is there!
Help2Help (click) BSplayer: simply the best & most versatile (Build 1072 Dutch language here!)
When posting always mention your computer's OS and the version and build number(!) of BS.Player as used by you,
as well as - if applicable and especially when encountering problems - the type(s) of the file(s) mentioned in your post.
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What have you tried when BSplayer gave you the error? Which error message is displayed?
AFAIK you can't use progressive bar bitmaps in combo with bar button..
BSP SkinMaker (v1.07) the one and only Skin Editor for BSplayer
BSP Definitions Manager (v1.02)
BS.Player's FAQ (by BSPeter) | Italian language file (v2.57 build 1051)
|bar or button, combo, track|