false positive file deleted even though actions are set to Disinfect and Quarantine

I had a (presumed) false-positive file get deleted by Zenworks AV even though I have the default action set to "Disinfect", and the failure action set to "Quarantine"... why did it delete the file without asking when I've told it not to do that?

Does it consider deletion to be a method of disinfection?

The file in question was a math library .dll for an engineer's CAD package, I really doubt it was actually infected with a trojan (Gen:Variant.Tedy.509105).  It's going to be a minor headache to get another copy of this file put back in place...

I'm wondering if I should set the default action to "Quarantine" to avoid this?