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 Working with WORD for more details.
XPS—Microsoft XML Paper Specification. This format is similar to PDF.