[Serious Beginner question....]

BOOM!  Thank you so much - easy when you know how.  

[Serious Beginner question....]

Hello

I'm not a designer but I'm quite tech savy, or so I've been told.  I started my own business a couple of years back and have always relied on another to sort my logo, business cards, posters etc but it frustrated me that I couldn't do this myself.

I downloaded the Affinity trial yesterday.  So far, I love it.  I find it easy to use for what I want BUT........... the files I receive from my friend are .eps files or .pdf files.
All of the .eps files I had on m computer have now been automatically converted to affinity designer files and can't be opened by someone who doesn't have affinity.

Is there a way of saving them in another format?

Any help or advice would be appreciated.
Many Thanks
Tanya