ZA usually only gives me a not-a-virus so I was surprised to get a Tojan-Dropper.Win32.Injector
The surprise was it was an old file saved from Windows XP time.
I mounted a backup drive unmounted for three months which would still have the file.
It almost immediately disappeared from File Explorer.
A check of ZA showed it had just been removed.
So this is a file that had been around on my main disk for ages $midimon.exe.
Could this be a false alarm?