Sorry David, your reply didn't come through to my email.
I have Windows 7. And yes, when I save the tree to a Gedcom file it has the.ged extension, not a pdf extension....explanation below
When I tried to open these files, it brought up a window asking me to choose what program to open it with. And the only program it showed was pdf. I understand now that somehow the default program for opening it had been changed and I'm not sure how. Maybe in the process of putting in a new hard drive and installing FTW again. That's something I am going to be looking at. Maybe uninstalling the FTW software and reinstalling it will help?
Now, I have done a restore, which had eliminated the pdf default issue. Now the file is shown as white, which always tells me that it will need me to choose a program to open it. And that's where I am at the moment...trying to work out how to save to a ged file which will open. I have looked at my backup files and they are the same....they won't open.
Any suggestions gratefully received....