You can save back to Mathcad 11 (if you own it), then from Mathcad 11 save back to 2001.
You could ask them to upgrade to Mathcad 14, which they can do for only $99, see notice under announcements. There are many features and differences between Mathcad 14 and 2001, so if if you save back to 2001, your files may be very different.
We currently only support saving back two versions.
Mona