cheat book your offer members
  • I downloaded the free members online book and cant open it it says it wants to know what file made it in order to open it please help
  • I think the computer is likely asking what to use to open the file. Being a .pdf file, it would have been made using Adobe Acrobat. To open and read it you will need Adobe's Acrobat Reader. It's completely free and can be found here.