Very simple methods. Pick 1:
- find someone with Mathcad 3.0 and Mathcad 4.0 (or newer) and a lot of spare time.
- Convince them to open the file in 4.0 and type it into 3.0.
Method 2 (preferred by PTC):
- Buy Prime 4.0
(Can you tell what I'm feeling?)
You can install (at no cost!) Prime 4.0 Express.
You get full functionality for 30 days of Prime 4 usage. That includes being able to successfully copy multiple equations at the same time time and paste them, e.g. in this forum. (for Prime 4 express it works only a single equation at a time).
But the copy-paste also works to a previous version of Prime (well, i tried it with Express 3.1 and it works).
I tried it the other way round (copy equations from Prime 3.1 sheet and paste into Prime 4 sheet) results in just pictures, no live equations.
So here's the way to do it:
Install Prime 4.0 express. Copy a single equeation in Prime 4 express and paste it into an empty sheet of Prime 3.0. If that results in an equation rather than a picture you know it should work to Prime 3.0 as well.
Activate your 30-day free license for Prime 4 and copy->paste all equations over.