A trojan?

I recently got out of work and decided to go on MS, I noticed there was a patch and let it update. After downloading all the patch files, they started to apply themselves to the MS client. I think when it got to the maps.wz part, McAfee popped up notifying me of a trojan that was removed. The updater finished, but with errors so now I am re-downloading the full client now.

 The log from McAfee

The pages I was directed to when I clicked on the virus type on McAfee -
Generic!Artemis
Generic!Artemis.)

I am not paranoid about this file, I'm just wondering what this file is and why it's being picked up by McAfee.

http://maplestory.nexon.net/Modules/Foru...e=1&type=1

http://maplestory.nexon.net/Modules/Foru...e=1&type=1

Hmm, I guess I need to pay more attention when I am on Nexon.net. I didn't think it was anything harmful, I was just curious as to what this file was. Thanks for the link.