The bucanero developer with the help of the dots-tb source code returns to the PS3 scene by releasing a new “gem” called PSV Save Converter . This tool converts and transfers PS1 and PS2 save files to the save format for PlayStation 3
.mcs: MCS PS1 files
.max: PS2 ActionReplay Max File
.psu: EMS PS2 file (uLaunchELF)
Drag and drop a PS1 or PS2 save file to the program. It will convert it so you can use it with your PS3 via USB.
Or use CMD:
./psv-save-converter < savefile >