This is the application portion of the old Super Turbo Tango Patcher. It should work fine on its original XP, as well as Vista, and even X64.
Most behaviors and caveats are unchanged from the 2600 System patcher, although they may diverge more, in the future.
Migration from previous releases integrated with the system patcher is handled automatically. You will need to upgrade the system patcher to 8.06, but you can do them one after the other without rebooting, and in either order.