Strange... that file is VRDB from avast!
Anyway, it should be there but to know if a file is a false positive, please submit it to
JOTTI or
VirusTotal and let us know the result. If it is indeed a false positive, send it in a password protected zip to virus@avast.com
Please, mention in the body of the message why you think it is a false positive and the password used. Thanks.
If the file is too big, you can use the ftp server of avast to send the file. Upload them to
ftp://ftp.avast.com/incoming (please, note that you won't have READ access to the ftp server, just write - so you won't even be able to see what you've just uploaded).
As a workaround, you can add these files to the
Standard Shield provider (on-access scanning) exclusion list.
Left click the 'a' blue icon, click on the provider icon at left and then Customize. Go to Advanced tab and click on Add button...
This link is a tutorial on how to help correct a virus detection that you believe to be false:
http://forum.avast.com/index.php?topic=25009.msg204838#msg204838