basically you need to find the "newest" .pack file with the file in it
so if it's not in 76_to_77.pack, you try 75_to_76.
keep working your way down untill you find one with the file in it.
(the file was in 74_to_76 for me, so what seespot said is probably correct.)
the one in 76_full should be the correct one as well.
make sure you take the right file and put it in the right folders.
(<mabi root>/data/db/skill/skillleveldescription.xml)
and i cannot stress this enough but make sure it's saved as an XML file, txt's won't work.
also make sure you don't remove anything vital. (like changing var1="200" to var1="0)
in my example it misses a " in the end, making the value "0 var2=" because the xml just keeps reading on. this
will cause a crash
the mods DO work, so if you crash it's most likely a fail on YOUR end
hope this helps