Hello,
after long searching and testing in the internet,
i found a tool ( freeware ) to convert any PNG, ICO, GIF ...
to BMP ( keeping the Alpha-Channel ).
I don't want to use Photoshop ( to much work )
DEFINE BITMAP oNewBrush1 FILENAME "test.bmp"
ABPaint( hDC, 0, -10, oNewBrush1:hBitmap, 255 ) // 0-255 transparency level
I tested many Applications.
After converting from PNG to BMP, there was no Alpha-Channel.
Now i found a working one with export PNG to Transparent BMP :
http://icofx.ro/
Regards
Uwe