Solved
It works when I try it in Prime 3.0:

What's the error message?
Prime can convert Mathcad 15 files, but not read them. See the input/output tab. You need to have Mathcad 15 installed, and the converted worksheet may not work, and may need editing.
Welcome to the PTC Community
No account yet? Create an account
Please use your PTC eSupport account.
LoginEnter your E-mail address. We'll send you an e-mail with instructions to reset your password.

