The trusted list is more for Windows applications and what are commonly called PUP's (Possibly Unwanted Programmes) and you can't in fact ask VirusScan to ignore an object it finds as an infection.
We are hoping that feature will be re-introduced sometime very soon, but can't promise anything as it's only a rumour.
You can, however, submit the file to Avert and hopefully they will send you an extra.dat to cover the detection.
In order to do that you would probably first have to disable VirusScan, then submit the file.
Double-click the taskbar icon to open Sec. Center
Click Advanced Menu (bottom left)
Click Configure (left)
Click Computer & Files (top left)
Disable VirusScan in the right hand module and tell it for how long.
Reinstate the files using the Restore tab on the left.
Then submit your files:
Send a file to Avert for analysis:
http://vil.nai.com/vil/submit-sample.aspx or
https://www.webimmune.net/default.aspor
Email file to: [EMAIL="virus_research@avertlabs.com"]virus_research@avertlabs.com
When submitting samples via E-mail all samples must be packaged in a .ZIP file. When creating this .ZIP file, it is important to understand that the .ZIP can be no more than 3 megabytes in size and can contain no more than 30 files. Additionally, any .ZIP file created must be password-protected using the password "infected" (minus the ""). Failure to follow these guidelines will cause your submission to be rejected.
How to Install an Extra.DAT