The JMA file format is a compressed SNES ROM file, produced by NSRT. NSRT can decompress the ROM, and the SNES emulators ZNES and SNES9X can open and play them. A possible glob pattern may be "*.jma" There is an entry on filext on this file format: http://filext.com/file-extension/JMA -- not much more info than in this bug report, though. Please let me know how I can help to add this file type to the shared mime info.
Please follow the instructions at: http://cgit.freedesktop.org/xdg/shared-mime-info/tree/HACKING#n31 for mime-type additions.
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