Sorry, that's not what you want. You've attached an .xml file containing an error message from the convertor. I can convert it to Prime, but you'll only read the text of that error message.
I suppose you have a Mathcad 15 (or before) file with the extension .xmcd or .mc that you want to have converted to Prime.
The latest version of Prime is version 7, and it has a built in converter that you should be able to use.
If you are NOT using the latest version of Prime, but version 6 or less, you have to have Mathcad 15 installed on the same computer for the converter to work. Note that Prime 6 and less CANNOT read a Prime 7 file, so you don't want the conversion to Prime 7 if you are on 6 or less.
If you still daren't or can't convert the file yourself, you have to do two things:
1. Attach your .mcd or .xmcd file.
2. Tell which version of Prime you use.
Then hope someone is willing to convert it for you.