I have tried the same pathway in win7 and i had no problem, however while trying the same steps in win8 i cannot insert picture.
I am going to make matrix analysis of picture.
I am selecting insert picture but the box is not the same which formates in win7. (First picture)
On the other way, I am trying to copy picture and paste on mathcad document, but also mathcad sees that file as a HTML document.
As a result, i cannot insert picture to my mathcad document.
In the screenshots you will understand what I mean.
I have tried to open a document which has picture in it, and i get this error. (last picture 3.png)
What service release of Mathcad are you using?
Edit : I have handled the issue by reinstalling programme.