Cardfile

Cardfile (sometimes spelled CardFile or Card File) is an address book application, with a native .crd file format. It was included with Microsoft Windows 1.0 through Windows Me and Windows NT 4. It has apparently been used as a clip art format.

Reportedly, the Cardfile source code was included in some Windows SDKs.

Format details
There are three known .crd file formats, which can be named after their signatures:
 * "MGC" format
 * "RRG" format, used when the file contains OLE 1.0 objects
 * "DKO" format, which uses Unicode text

Identification
Files begin with ASCII "", "", or "".

Specifications

 * Archived copy of Q99340: Windows 3.1 Card File Format
 * Microsoft Support: Windows 3.1 Card File Format (from archive.org)
 * The Cardwin Project website - Has information about the format

Software

 * The Cardwin Project
 * Freeware 64 bit and 32 bit CardFile replacement
 * can extract images and text, in most cases

Sample files

 * [Ed. note: Somebody confused CRD format with CDR format.]
 * https://telparia.com/fileFormatSamples/document/cardfile/
 * https://telparia.com/fileFormatSamples/document/cardfile/
 * https://telparia.com/fileFormatSamples/document/cardfile/
 * https://telparia.com/fileFormatSamples/document/cardfile/
 * https://telparia.com/fileFormatSamples/document/cardfile/
 * https://telparia.com/fileFormatSamples/document/cardfile/

Links

 * Cardfile