.CRD File Extension

Microsoft Windows 3.x Cardfile

Data File
Question: What is an CRD File?

Have you found, downloaded or received an CRD file, but don't know which software program is required to open it?

Before attempting to open an CRD file, you'll need to determine what kind of file you are dealing with and whether it is even possible to open or view the file format.

Answer: Files which are given the .CRD extension are known as Microsoft Windows 3.x Cardfiles, however other file types may also use this extension. If you are aware of any additional file formats that use the CRD extension, please let us know.

How to open a CRD file:

The best way to open an CRD data file is to simply double-click it and let the default assoisated application open the file. If you are unable to open the file this way, it may be because you do not have the correct application associated with the extension to view or edit the CRD file.

This data file format was added to our database by a visitor to this site, but no additional information was provided. We have yet to investigate this file type further, or there was not enough information available at the time to report accurately on the format.

Please check back soon for more information as we are constantly updating our file descriptions based on search frequency.

Tip: Try to open the CRD file using a text-editor such as Notepad, as many file types contain simply contain unformatted plain-text and can viewed correctly using this method.

Other .CRD file extensions
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    Comments (2)
    showing 1-2
    Bob Peffers
    2009-07-08 03:40:36
    .CRD files were the extension used by a great little program called, "Windows Cardfile". This was part of windows 3.1 but, if you can obtain a copy, it will run very well on XP and Vista.

    It is a personal information manager/database program and can even handle BMP files. It takes the form of a simple cardfile, (obviously), with an index and a card viewer. It is simple to use and one wonders just why MS ever dropped it from present versions of Windows
    Harry Bee
    2011-03-15 16:32:11
    There are at least three versions of the .crd data file for Microsoft Cardfile that was originally distributed with, and automatically installed by Windows 3.1. (Some later Windows versions had it, but didn't install it automatically.)

    I have seen two of the formats, and they are substantially different from one another.

    The one signed MGC (first three bytes) seems to be a text-only format and is probably the earliest. (That is, the MGC files I've seen have cards with only text in them.)

    The one signed RRG has cards that can have both text and graphics. I'm assuming most users of MS Cardfile didn't even know you could put images into the cards; I didn't know until I started researching the format. The bitmapped images could be embedded (by dragging/dropping), OLE objects, or linked objects.

    Then there were at least two later formats:

    One of them, in a (hidden) version distributed with Windows XP uses 16-bit Unicode characters. Apparently this version was signed DOK.

    And I've seen references to still another 8-bit format, but haven't been able to verify that.

    The information I have on the 16-bit version comes from the Microsoft site, the only place I've found a full format map.


    That map doesn't appear to be for the 16-bit version, however, and it's not for either the MGC or RRG versions I've seen and decoded. (Okay. Truth be told, I have not fully decoded the RRG version, but just enough to get the text out.)

    .crd files from MS Cardfile can be read and used by AZZ Cardfile, that you can find easily, and I think can be imported by MS One Note (not verified).