Ah got it all sorted now. I renamed the campaign DLL by accident. Mod working too, just needing clarification with regards to extracted plane CAT files, other sound mods only needed to be put into their respective mod folders.
Hi all, need a bit of help with some modding I'm doing. The mod requires me to extract the data ini of a stock plane in this case the F4-E-75, so I can change a sound value which I have done, however what do I do with the now extracted CAT? Trying to launch my campaign now causes a game crash.