This dialog box is part of the Language editing modes dialog. These options allow you to specify the names of external utilities (commands or programs) which should be used under various circumstances.
"CRiSP overall is a terrific text editor. It contains the changes to Brief which I would have liked...It is nice to be able to at last have a good BRIEF like editor for Linux machines. In my reports to the minerals exploration industry, I have extolled the virtues of CRiSP."