Miracles of Compatibility:
Word 2003: I can't open this. The file was created in a newer version of the program.
Compass: I can’t open it. The file is created in a new version of the program.
DipTrace: I can’t open it. The file is created in a new version of the program.
AutoCad: It is not possible to open the file because it was created in an earlier version of AutoCAD!