Reset skin from outside the game?

[Death Ball]

Saw that checking cache of game was a way to get the get CD Key option back in Steam.

Now the skin doesn't work right and I can't access the option to set it back to the original from inside the game, but I don't find the ini file to do it.

Searching the forums has given no results


EDIT - Whooops, I had missed there's a help thread where I should have posted this, sorry. Also, I have not option to delete this thread.