CRD Format
CRD format is a binary file format used by Windows CARDFILE program. NOTEFILE can read most versions of CRD files created by CARDFILE, but it will not save your data in CRD format, because it is a very restrictive format. When you open a CRD file, you can make changes to it in NOTEFILE, but later you have to Save As... an NTF or TXT file.