Rock, what's this Toyota Supra that you want to edit? Can you post the link from where you got it?
We really need a new Ultimate Tweaker for this.
To modify even the locked addon cars. Oh wait, that is illegal?
Yeah, a new similar program would be needed, to be able to change all the tuning files values only opening the add-on car .ar file.
FYI, MM2 Ultimate Tweaker works with locked add-on cars. Where it fails showing the "There's no PKG" error message is with the .ar files zipped with WinZip, locked and not.
The edit of the feature of a game mod is legitimate when done for own personal use.
It's illegal in the first place to take models from games and convert them.
That's valid for those who sell them, use them in own sold products or get money in other ways through them. Otherwise, probably GameModels.ru, that doesn't use advertisements, had to be sued by some game producer and had to shut down...
The author can't take legal action against you for unlocking "their" conversions.
You mean "their" models, because the conversion
is their, actually (they put free time and effort to do the conversion). That's however true, but the possibility to lock the own release can be seen as a free legitimate personal choice, also when it's for the mere packing finality.