Hi Superbeast2013 and Maev81.
I got notifed about it this morning and we've removed the offending file.
A hacker got access to two accounts and used one of them to upload the virus laden file. I've tracked down about five ip addressed and blocked them all, and as of right now it appears to be the only file he infected.
Just downloading the file doesn't cause an infection on your computer. Unless you went in and opened the lnk file you should be fine. The client doesn't open the file automattically.
We've notified the account owners and had they've changed their passwords. We've removed the file, and it's been sent to Blizzard's Warden team and will be submitted to our antivirus manufacture as it bypassed our server's scanner. We're also going to shore up our filters to flag lnk files in the future.