No, no, no!
What you do is delete/backup Texturescripts.rez, then make a FOLDER OF THAT.
Then you extract GUNS_M_PV_MELEE.rez and put the resulting folder in Texturescripts.rez (the folder!)
Then you put the ****b's from your superknife mod into the GUNS_M_PV_MELEE folder. In your case, it's C:/Nexon/Combat Arms/Game/Texturescripts.rez/GUNS_M_PV_MELEE
Run the game!
Idk if it makes a difference tho.