I saved it and unzipped it, but it's a 752Kb exe file.
Sorry, I'm not clicking on that without a good explanation of what it's doing. If this is supposed to be a ROM from a technically savvy person/group, they should be able to figure out how to post a large file.
Just for giggles, I went to
www.pdatech.net.
The website declined to show this webpage
HTTP 403
Most likely causes:
This website requires you to log in.
What you can try:
Go back to the previous page.
More information
www.bbgweb.net looks like a real business... that's good.