Community Tip - Did you get called away in the middle of writing a post? Don't worry you can find your unfinished post later in the Drafts section of your profile page. X
See here -> https://community.ptc.com/t5/PTC-Mathcad/File-type-is-not-supported-MathCAD-Prime7-0/m-p/727726/highlight/true#M195844
