The issue was most likely the bit depth of the bitmap image. Headers should be set to a bit depth of 24-bit; higher settings (if set to 32-bit) will be invalid for use as headers in skins.Just tried it now and can confirm that the .bmp file that you posted balala does indeed work for me, and it displays correctly when installing the .rmskin file! Hopefully I can figure out how to get images into the right format in the future with the last few posts you both have sent, thanks again for all your help!
In paint.net program the option is available in the BMP save dialog:
Statistics: Posted by eclectic-tech — 58 minutes ago