This option converts the save file to work with older versions of the game.
Recommended if you use an older version of the game (1.0.x or 1.1.x) and the save file was created with a newer version (1.2.x).
How do I know which version I have?
Find your GTAIV.exe, right click it, select Properties, go to the Details tab, and look at the File version or Product version property.
Alternatively, upload one of your save files to this site and it will tell you in the save file's info.
