Many programs which use their own proprietary file formats may allow you save your drawing to a different format.  Some software may allow you to make a PLT file in much the same way as described above in AutoCAD.  It may also be possible to export your drawing into a different file format like a PDF.  If you are unable to export your drawing into one of our usable file formats you can always email the file to bobbroden@nashuarepro.com and ask us to try and open it anyway.