Thanks for the reply man! If I ever figure it out I’ll report back for others’Thanks. I really wish I could help but if Adobe pro( you can test trial version for free for 7 days) or a free program like Lightspark won't open it, it's far above my computing skills. Try downloading the free programs and see if they work for you. Otherwise you'll need to find a local computer expert on your area to see if they can help.
Also if anyone knows how to save the website diagrams as pdf like OP did here plz let me know and I’ll just buy a one day and do it that way