There are mime types for most commmon roms (for emulation) but not for Super Nintendo (*.smc) or Gameboy Advance (*.gba)
2006-07-14 Bastien Nocera <hadess@hadess.net> * freedesktop.org.xml.in: add application/x-snes-rom and application/x-gba-rom types for SNES and GBA Roms (Closes: #7511)
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