Cardfile

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File Format
Name Cardfile
Ontology
Extension(s) .crd
Released 1985

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.

There are two .crd file formats, which can be named after their signatures: "MGC" format, and the somewhat more advanced "RRG" format.

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Identification

Files begin with ASCII characters "MGC" or "RRG".

Software

Sample files

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