I had to reinstall avast and I reconized that it left a file in the folder of the setup files (see attached pic) :
:
What is this ? :
This is not an Avast file as far as I know.
It appears to be a file used by “The Bat” an Email antivirus program by Ritlabs.
I do not believe that Avast “borrows” files from another antivirus program vendor to run the Avast email protection.
I will send a copy of the post to one of the Avast Team for confirmation.
It’s the avast! Bat! plugin…
Maybe you installed its beta-version…? In this case, the uninstaller would of course leave it there as the setup is not responsible for it.