So this is the command line formatting required by 1964 GEPD, and there are actually a few posts touching on the topic about problems setting up this emulator that are generally unresolved, this is how I come across the game specific command override work around, but some of that stuff is quite old and I had assumed there must be ways to make simple edits to the launch commands and fix it properly.
If there is confusion as to why I am setting up this emulator specifically, it is because this is how you can play goldeneye / perfect dark nicely with mouse and fov customisation, I do not believe there are alternatives to this so this is still the best emulator around for this.
@Koroth I didn't have any luck with the %romfile% approach, but its interesting if there is advanced syntax for modifying the launch command, this is what I was hoping to see, is there documentation on these commands? There is the slight issue of emulators not specifically using just one extension so if it was hard set then I guess i'd have to look at converting between formats, lol it is such a funny situation, I really thought this would be a simple thing to do.