Board Thread:Questions and Answers/@comment-6799279-20150124092911/@comment-3182180-20150125011150

I see, you are playing CSN:Z.
 * The cstrike is the old game files for updates from 2008-2012. (In Korea)
 * For dstriker, it's the new game files for updates 2013-now.
 * Dstrike_na is the exclusive file that does not present in original CSO.

To see the list of updates, see it here.