i have two questions

[RedDevil]

Just going on experience here.. both players need the same files to prevent an error message
If you make a new scenario file, rename it in some way to prevent an overwrite of the original and send your OPP the new files so he has the same thing as you.

I believe if you copy the file over it will work... but Warhorse (Mike)is much better suited to answer than I ?!
He really IS the MAN to ask.. and buy him a beer or several or some chrome for his Impala :)

Dev