Extract the correct .pack file.
Might wanna point to a guide or more info than that, cuz that's relatively vague if he don't know which pack file to grab to begin with.
MabiUnpack gives me an outdated file, like for example if i extract skillinfo.xml there are no ninja skills within. My Mabi runs perfectly I'm just unable to edit any xmls inside the .packs because of this
Outdated file does mean you have the wrong pack. Think of it this way, mabi counts up for each update. First pack, is your XXX full pack. After that you have XX1_to_XX2.pack. Basically it'll count up each pack, the bigger the number, the more recent it is. It works this way with a lot of programs btw, not just the .pack files, so you might keep that in mind for the future. If you extract from the largest number, you should have the current version.
If you open the largest number, and there's no skillinfo.xml, or w/e file you are looking for, then you want to open the next biggest pack. So if 206 to 207 is the biggest, there's no skillinfo, then you want 205 to 206, or just XXX to 206. The numbers will change depending on how often you update/play the game, and sometimes nexon will just combine two pack files into one, and do something like 200 to 202 pack, even if you don't miss an update. The last number, after the to, is what you're looking at though, that's the important one.