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.crd

File Type Windows CardSpace File IconWindows CardSpace File
File Format Proprietary (Microsoft)
Usage Open manually; may be referenced by an application
Popularity ★ ★ ★ ★ ☆  Common
Description

Database format used by Windows versions prior to Windows 95, such as Windows 3.1; opened with cardfile.exe, not included with Windows 95 and later.

Open With
Windows

IconMicrosoft Windows CardSpace

IconAZZ Cardfile

Published 2007
Information from the PC File Extensions Reference
https://pc.net/extensions/crd
space