It's easy,

I've got a game, and it contains:

Acknex.exe (A6)
weds
wwmp2wmb
About 50% of all .MDL files that the game uses.
NO SCRIPT FILE cause it's compiled, but not fully compiled, otherwhere there would be no .mdl files in the game folder atall!

When I start Acknex.exe, I can play the game, no problems atall, but I wonder why not ALL .mdl files are included?

How is that possible, and it really do need these 'open source' .mdl's, cause when I edit one of them, the game will act strange or won't even start atall, how is this possible not all .mdl's are open source, or is there a way to get them? ^^