If you are moving saves between different PCs or versions, they may not appear because they are tied to a specific SteamID used by the emulator. You may need to edit the emulator's .ini file to match the SteamID of your previous save.
Repacking a save game can be incredibly useful for various reasons: save game halo infinite repack
Depending on which repacker (FitGirl, DODI, ElAmigos) and which internal crack emulator they used, your save files will reside in one of the following directories. If you are moving saves between different PCs