I've been trying to get a specific setup to work within Steam's game launch options, but I can't figure out how to do it correctly. In this example, I've been trying to make my Steam copy of GTA3 redirect to the PCSX2 emulator, while using an ISO of GTA3 in a different directory,

Putting in is simple enough- just gotta select the game manually from there- but I've been trying to figure out how to make it so that it also used the correct file with the executable.

Has anyone else tried this, or something similar to it?