Beecall help!

Ok trying to find the smartest group I can to help me solve a problem.

Beecall www.beecall.com has been discontinued (how long I don't know its old) I still have some old messages that I recieved on becall when it was active. The file extention is .TGO

Since the service is cancelled I can not install the program even though I still have the original install program on disk because it runs you throught the registration process which does not work of course.

I am trying to find a way to listen to these old files but can not find a .TGO player and can't run the original software.

In the past when becall was working I could play these old files and listen to them -that was years ago. Now after many formats and new hard drives all that remains is the useless install program.

I have tried naming .TGO to .wav but it won't play so that easy solution is not valid.

So I am looking for a way around this problem.

Could I edit the .TGO file somehow to make it a different format?
Can I somehow decompile the install program to suck out the goodies in it and play it that way?

I would include the file, which would make this a whole lot easier but they are of a personal lovey dovey nature.

Any ideas would be greatly appreciated