Yo
Im afraid that lm not exactly sure which file you are referring to, lf l knew more accurately, l would give it a go. My skills at fiddling with code are very basic but l am always up for a challenge.
Yes indeed a Mac Launcher for NeoCairo was put together by Team Orbit, back in January 2002! only 6kb in size too. Of course all the links I followed were dead,. One of the sites l looked at in my search for the launcher gave a really glowing review of the mod! , Im surprised it has faded into seeming obscurity considering how much is still available for UT 99.
Of course the problem with reading about something being really top notch is that you suddenly find yourself developing a burning desire to make it work!
Anyhow, if you have more specific instructions on changing the code, it would be cool, I might poke around in the mac game forums, someone may still have the Launcher somewhere.
Cheers,
DJO