Nicktoons Racing (Windows)
A kart racer featuring Nicktoons characters. Yep.
There is a test course model called test.OPD, add info on NASCAR Racers.
SC20.WIM has a badger wearing a green suit. It might have a relation to Jeff Badger, who is listed as "Morale Consultant" in the credits.
SC01.WIM has a meter saying "MAINSCREEN". It doesn't fit the game's art style at all, and is most likely from when the game was called NASCAR Racers.
In toonse.TDB at 51A is a leftover from an E3 demo.
NICK TOONS E3 DEMO