I’m not sure it’s a false positive… are you sure? Do you know to which application that file belongs?
Can you send it in a password protected zip to virus@avast.com ?
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…
You can use wildcards like * and ?. But be careful, you should ‘exclude’ that many files that let your system in danger.
When you submitted this to VT I guess it told you it had already scanned this file as the results date from (File L2.exe received on) 09.19.2008 06:40:30 (CET), so that scan is 7 days old
I always have it repeat the scan as there is more likely to have been either more or less detections in that period, essential when trying to gage if it is an FP.