When loading a new car set the new car set must be in its own directory
withing the cars directory. \nascar\cars\(carsetX)
In addition, the name of the directory must be the same as the name on
the carset.dat file. For example if the carset is called cars96.dat,
the directory must also be named cars96. Also the original cars94 must
be there as well. Check to see if the names match and it should fix
your problem. My game crashed a few times befor I discovered this.
M. Roberts
Chapel Hill, NC