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H4M is game format that uses AOT (Adaptive Orthogonalized Transform) based vector quantization image compression.

  • HVQM3 is used on N64 Mario Party series games
  • HVQM4 is used on some Nintendo GameCube Biohazard/Resident Evil series games

H4M files begin with the ASCII characters "HVQM" followed by versioning information. Most of he format is unknown.