In a nutshell, yes. You have to look for the 'AttachmentType' entries in the data.ini files of the aircraft; those represent the aircraft hardpoints, where you'll see designations like 'NATO', 'WP', and so on, depending on what kind of aircraft we're talking about.
If you have the file that capun referenced, you should mine that first, because it contains data.ini and loadout.ini files for a ton of different aircraft, updated for you in accordance with Bunyap's classification system. With those files, weps updating could simply be a matter of copying and pasting files into your aircraft directories.