Symantec identifies PortableApps autorun.inf as virus and quarantines

I use PortableApps on my USB drive so if I use a public computer, I have the apps available. PortableApps (http://portableapps.com/) installs a "autorun.inf" file so portable apps opens when the USB drive is inserted.

 

How do I prevent antivirus from quarantining this? I restore it from quarantine but it is immediately recognized again and removed.

 

Thanks

steve