Ninja Ripper not working with Viva Piñata?

[sectoid]

I've followed this guide to the letter (except for the part where the guide says to select viva pinata.exe instead of the launcher, that was a mistake on the uploader's part,) and yet Ninja Ripper isn't ripping when I press F10 or any other hotkey while playing the game. Can anybody help me out here?
UPDATE: I solved it, it was because I was running the game in compatibility mode.