The .sff file extension is most commonly associated with structured fax files. These files are created for Group 3 fax documents. The SFF files contain compressed raster images as well as the page structure of the fax transmission.
The .sff file extension is also used for Stage scene files, M.U.G.E.N sprite files and Soldier Front Client map/weapon/character model files.
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If you have additional information about the SFF file format or software that uses files with the SFF suffix, please do get in touch - we would love hearing from you.