I downloaded a zipped file (created by myself) from the electrical engineering community, after unzipping, I try to open it with mathcad (15), but the program fails to open and crashes.

On 15 december 2015, I have published two files relating to the same subject: the power lines in DC. The first .pdf and the other xmcd.zip. Why, after downloading the file with extension xmcd.zip and unzipping, mathcad crashes? while the original worksheet works properly...Can I do something to retrieve it functioning?

Thanks

FM