WinRAR error('s)? need help

Recently I've been looking for some weapon mod's.. i found some good one's but when i try to extract using winRAR to my nexon combat arms game folder.. it says Unknown method in Guns_M_PV_MG.rez and No files to extract.. i tried re-downloading but it didn't work..

Note: i'm trying to extract files from the Mk.48 to P90 mod.

You might wanna Try extracting Them to your desktop, Then dragging them into the folder instead of Extracting them files straight into the Combat arms folder. Thank me if i helped