I am a fan of Avast (Free Version) since my family loves using it, so I made my own, solo account for needs that are personally satisfying...
Today, I still received (and confirmed it is) a false-positive on a .EXE Decompressor named UNLZEXE for Win32, of which I tried submitting to Avast's service, but it failed for some reason! UNLZEXE has the same genre of false-positives as [UPX] back then, and wasn't seen until recently with UNLZEXE!
It should not be detected as anything, on mine it says [Win32:MalwareGen] falsely.
UNLZEXE is, should be, and always clean! Link can be PM'd or Posted if needed
EDIT: See post for more info, since it is now verified as a Backdoor!
EDIT2: Now truely verified as a false positive, so I am right, not a backdoor!