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Dreamcast saves not detected for syncing #254

Description

@chedge

Describe the bug
Dreamcast save files don't seem to be properly detected for save syncing, at least on Knulli using the default emulator, Flycast. Flycast stores saves four at a time (for some reason) with the following format:

game_filename.A1.bin
game_filename.B1.bin
game_filename.C1.bin
game_filename.D1.bin

Based on the Grout docs, I think the first issue may be that the save files have a .bin extension, which is not one of the accepted save file extensions. I'm also not exactly sure why there are four save files for each game, or the best way to handle that. I'd guess it's one for each potential virtual VMU across four controllers, not sure what the best solution is there.

Reproduction Steps
Steps to reproduce the behavior:

  1. Try to sync saves
  2. Dreamcast saves don't sync

Expected Behavior
Dreamcast saves sync

Information

  • CFW: Knulli
  • CFW Version: scarab 2026/05/11
  • Handheld Device: Anbernic RG35XXH
  • Grout Version: v5.0.0.0
  • RomM Version: 5.0.0

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