ASH tools is a program which extracts and creates .pac files as well as .pcs files. Pac files contain textures in Nintendo games, such as Super Smash Bros. Brawl. After they are extracted by the program they can be edited with photo editing software such as Adobe Photoshop, photofiltre, or paint.NET. Note: MS Paint will not work.

http://wiibrew.org/wiki/ASH_tools