A .GED file is text and can be read using Notepad (if small enough) or Wordpad. Be careful not to save from wordpad/notepad though. You can scroll through the file looking for anything that is not alphabet nor numbers.
Also, NEVER import a .GED file into your existing .PAF file without first creating a new (therefore blank) file and IMPORT the new data into it for examination before combining it with your existing data. I've known many folks who just added the .GED file and regretted it.