NDE (NEXUS Data Editor) is a program to create and edit NEXUS format data files on computers running Microsoft Windows 95/NT 4.0. The main motivation behind my writing the program was to provide an easy to use data editor similar to that provided in the Macintosh program MacClade (note that NDE has none of the data or tree analysis features of MacClade). The NEXUS format is becoming more widely used on PCs now that DOS and Windows versions of PAUP* are available for testing.