How to Use the Assoc Command to Change File Associations

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Article ID: 184082 - View products that this article applies to.
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SUMMARY

This article describes how to use the Assoc command to display or change file extensions and their associations.

MORE INFORMATION

The Assoc command can be run only from a command prompt.

NOTE: When you use the Assoc command, the changes you make are immediately written to the Software registry file.

  • To display a list of file extensions and their associations, type assoc at a command prompt, and then press ENTER.
  • To display the association for a specific file extension, type assoc .<xxx> at a command prompt, and then press ENTER, where <xxx> is the file extension whose association you want to view.
  • To change the association for a specific file extension, type assoc .<xxx>=<file type> at a command prompt, and then press ENTER, where <xxx> is the file extension whose association you want to change, and <file type> is the program, dynamic data exchange (DDE), or OLE object you want to associate with the file extension.
  • To delete the association for a specific file extension, type assoc .<xxx>= at a command prompt, and then press ENTER, where <xxx> is the file extension you want to delete.

    NOTE: You must type the trailing space after the equal sign (=). If you do not, the association is not deleted and you receive the following error message:
    File association not found for extension .<xxx>

Properties

Article ID: 184082 - Last Review: October 31, 2006 - Revision: 1.1
APPLIES TO
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Server 4.0 Enterprise Edition
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kbenv kbhowto KB184082

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