Working with PTC Mathcad Prime > Worksheets and Regions > About File Formats
  
About File Formats
You can use Save As to save your worksheet into one of the following XML-based file formats which are ideal for accessing, searching, and storing information:
MCDX—Native PTC Mathcad file format for worksheets.
MCTX—Native PTC Mathcad file format for templates.
RTF—Microsoft Rich Text Format.
See About Copying Worksheet Regions to a Word Document for more details.
XPS—Microsoft XML Paper Specification. This format is similar to PDF.