Does anyone know if you can open them into Fritz 10?  If so, how? Or am I just wasting my time? I want it to have a look at some of my defeats

I save pgn files to the desktop then (in Fritz), click  >file, > open, > database, >open, >database, and navigate to desktop and doubleclick on the pgn file, or you can create a database for your pgn files in the same folder as your other Fritz bases.