Please zip and password protect the suspect file and email it to virus @ avast.com. (remove the spaces)
Put the password in the body of the email, give a brief explanation of the alert and let them know you believe it could be a false positive.
This will be checked and if false an update to the VPS can be actioned.
You can also check the file against one of the online scanners, see RejZor's Website - Security Ops for a list of On-line Virus Scanners
Security.Ops.tk