So, you automatically believe this is gameguard logging why? Because it seems to have relevant relations to something website based and it is in your L2 folder? I'll bet you if you find a friend and ask him what size those files are in his directory he reads you the exact same file sizes that you see. Why? COULD IT BE POSSIBLE YOU AND HE VISIT THE SAME WEBSITES THE SAME AMOUNT OF TIMES EVERY DAY!?
Maybe...
Or maybe it's simply NCSoft's HTML-XML interface files for the launcher/NCStore