DECRYPTION of 2 or 3 XMZX files

The files were downloaded in preparation to be used with Exam. Orginals are either a .rtf Word Doc, or PDF. No audio, no video. The files almost definitely have some kind of call-back feature/security when tampered with files must ONLY be opened offline (+ additional precautions I may not even be aware of) - this is a critical factor because I can not risk there being an possibility of determining I opened these files ahead of a predetermined date. I should be able to simply send you the files and if not, will need to walk you through a SoftTest login, I may need to pay for another download, etc.