can I scan a file already in quaratine with AVG?

I have a suspicious file in Quarantine and I would like to see if it’s a virus of some sort. I scanned my pc and the folder with AVG where quarantine says it’s located but nothing showed up. I used windows explorer to look in the folder myself can’t find the file in there either. Does the firewall move the file to another location when placing it in quarantine?
I’m running windows xp media center, version 3.0.13.268 of Comodo Firewall. and the latest version of AVG antivirus.
The suspicious file is rbSolnUpdateENU.2.5.0.exe and is located in the temp folder.
thanks
taz