I can't find any information anywhere about how to change the default paper
size in excel and publisher.

I inherited 6 computers which have all been haphazardly thrown together and
I'm gradually changing all the settings etc to a user friendly standard...

I found instructions for Word, but Excel and Pub both still default to
Letter...

I don't have access to the install media or codes, or any newer versions.

Can this even be done - I would think that this would be a common problem...