I assume you have this in a .rc file (not in a .prg), is that correct?
Problem probably has to do with the backslashes, better just use double ones, but for all subfolders, as in
And to make sure it's not a problem with relative paths, if the above does not work, please try to use an absolute path (but keep using double back slashes)
Thank you for the quick reply. It turn out both relative and absolute paths with the double slashes works, but I have to rename the bmp from "UTUIA-LOGO-16-333X82.BMP" to "UTUIA_LOGO_16_333X82.BMP".