Alright, Mead, I think I know what you mean. You want to change the data personally, right? BTW sorry again for the long reply time, I had to get through some tough school exams. I hope this will help:
First, you'll need to get a hex editor. You can use a trial version of hex workshop 4.1 for over a month. Use it to open the files in the Data directory of your F/A-18 folder. Inside, there should be various xx.DAT files that you'll be able to hex edit. The names are pretty self-explanatory (e.g. Fshipdb.dat). To change loadouts, you'll need to open Floaddb.dat and Fnloaddb.dat. Scroll through the data and search for the loadout of the plane you want to change. THe data values for air-to-air missiles (the ones I know) are
For example, if you open Fnloaddb.dat, scroll down to the F-22, and decide to change its Full-anti air loadout, you'll first see the numbers 4675 6C6C 2041 6E74 692D 4169 7200, which just represents the name "Full anti-air." Now, we know that the loadout comprises of AIM-120s and AIM-9Xs, so we'll just look for the values "26" and "6D." You should be seeing this somewhere below the name (they don't necessarily have to be right after each other or even on the same line)-
6D00 0200 (which means AIM-9X 2)
2600 0600 (AIM-120 6)
These numbers tell us that the Raptor's full anti-air loadout is 6 AIM-120Cs and 2 AIM-9Xs. Now, suppose you want change the AIM-9X into the AIM-9M. All you have to do is change "6D" into "25," so that it looks like this -
2500 0200 (AIM-9M 2)
REMEMBER that although you may change either the type of weapon in the loadout or the number being carried by the plane, you cannot change both! For example, in the F-22, you can either change it to two AIM-9Ms, or four AIM-9Xs, but not four AIM-9Ms. I know it sounds somewhat confusing, and I'm not really explaining it well, but once you get to it, its actually pretty simple.
If you need more help, go to - http://www.ao.net/~chuck/f15/f15btr.htm
Its about hex editing for Janes F-15, but it can prove valuable because the values representing the data in both JF-15 and JF-18 are the same. For instance, 26 represents AMRAAM in both sims; likewise, 1D in both sims represents the GBu-24 LGB.