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ASSOC

Displays or modifies file extension associations

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Extension: FileType: Delete?

Presets Display all the current file associations. Displays the current file association for .zip
Delete the association for .zip Modifies file extension .zip to 7-zip

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Displays or modifies file extension associations

ASSOC [.ext[=[fileType]]]

  .ext      Specifies the file extension to associate the file type with
  fileType  Specifies the file type to associate with the file extension

Type ASSOC without parameters to display the current file associations.
If ASSOC is invoked with just a file extension, it displays the current
file association for that file extension.  Specify nothing for the file
type and the command will delete the association for the file extension.