

oh forgot the second part.
first of all. .pub
files are not microsoft owned keyfiles, but Microsoft Office Publisher documents. this is irrelevant now, but this is the only connection of microsoft with .pub
files
second of all, .pub
files can also be OpenPGP public key files. do you use SSH? look into your ~/.ssh/
directory and you will see them there too. also in /etc/ssh/
and the summer heat didn’t even arrive yet! what will they do, will they evaporate a few months later?