It is read-only. I have been using it as a practice map and having played it 5 or 6 times, and each time it has played remarkably different. If you can't get it on a website please mail it to the adress in my profile.
Profile address is good.
If you e-mail me the saved game I'd be happy to put it on my Civ site so anyone can download it. And this game is a version 2.42, which I think works for most everyone. I wasn't sure about which year improvements and wonders were completed. The turn ends and the next one they're completed. I always thought it was 1851 AD since they have no effect in 1850 AD, but then I noticed the date discrepancy.