Will I be able to use . pc3?

I am working on dwg files.

Today I was sent files in a folder labeled "PLOTCFGS" and in it are 2 ctb files (which I have been using) 2 pc3 files (Adobe PDF.pc3 & 24x36.pc3). I have not used these types of files before. I am concerned that this will be a problem for me as I am the only one using Microstation.

Thank you for any help and/or advise