you need 2 tools.. (or one of them)
1. pentium tools by xakumm
2. muimgui or any other MU files to IMAGE converter/viewer (best is pentium tools)
then in menu of pentium tools browse your client folder.. maybe Interface maybe Logo (dont remember exactly now) and preview the images.. untill u find exactly what u want to change, then convert it to IMAGE file .jpg or .tga or whatever it is....
and then design with photoshop/paint and re-convert back to MU file using the same program and replace file and u are finished
similar to this:
You must be registered to see links
but not for .TGA files