The file is encrypted to prevent simple text editing. An editor tool or a hex editor is used to bypass this encryption.
For the casual player, learning to edit this file is likely not worth the permanent account ban or the hours of troubleshooting checksum errors. For the dedicated modder who plays exclusively offline or on a disposable "guest" account, it is a fascinating puzzle. real racing 3 character.2.dat editor
If you see a string that looks like driver_suit_white , and you want to change the suit color, you have found the relevant offset. The file is encrypted to prevent simple text editing
If you use one, never set your Gold higher than 5,000 at a time, and always keep a backup of your original, unmodded file. 000 at a time