Cardfile
Unknownimage
Cardfile (also Card File or CardFile) is a personal information manager, based on index cards. It was initially released with Windows 1.0.
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| Extensions | .crd |
|---|---|
| MIME types | application/octet-stream |
| Signatures | 4d4743 at byte 0 |
| PRONOM | fmt/1254 |
| Wikidata | Q83884456 |
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From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.