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