.EMM File Extension

Street Fighter IV, Super Street Fighter IV, and Street Fighter x Tekken were all developed by Dimps, in collaboration with Capcom. All of these games contain EMM files and use them to specify characters' and stages' color schemes (including characters' alternate color schemes).

The color data that EMM files contain is saved in an RGBA format, which specifies each color's RGB value and opacity. Each material associated with a character or stage, such as skin color, hair, and articles of clothing, has its own sets of RGBA values.

While most players will never encounter or need to edit an EMM file, Street Fighter modders have created utilities that allow them to open the files and adjust the color values they contain, to customize characters' and stages' color schemes.

You can open an EMM file with EMMEdit (Windows). Doing so will allow you to edit the color values the file contains, and customize the associated character or stage's color scheme.