Most mods for this era are "drop-in" replacements. You typically navigate to the game's installation directory (often C:\Program Files\THQ\MotoGP 3 ) and overwrite existing .dat or texture files.
: Use tools like 7-Zip to unpack your downloaded mod files. motogp urt 3 mod
: Use a tool like WinRAR or 7-Zip to unpack your downloaded mod files. Most mods for this era are "drop-in" replacements