I recently run a test with Bitdefender and there were several encrypted files that it could not check.
All of them in were in APO.zip
files which were contained in another Zip files.
Some of them were in C:\Windows\System32\drivers\rtkhdasetting.zip
and one in C:\Program Files\Realtek\Audio\HDA\rtkhdasetting\103C82BA
folder.
I don’t know what to do with these neither how to open them.
PATHEXT
environment variable, you will find other file types that windows is willing to host through known registry associations. For instance, .BAT files have no binary code but windows will run them with cmd.exe. Defender has your back and I don't know why you would go seeking to open random stuff defender told you might be a problem.