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# Mimetype Aliases

ownCloud allows you to create aliases for mimetypes, so that you can display custom icons for files. For example, you might want a nice audio icon for audio files instead of the default file icon.

By default ownCloud is distributed with `owncloud/resources/config/mimetypealiases.dist.json`. Do not modify this file, as it will be replaced when ownCloud is updated. Instead, create your own `owncloud/config/mimetypealiases.json` file with your custom aliases. Use the same syntax as in `owncloud/resources/config/mimetypealiases.dist.json`.

Once you have made changes to your `mimetypealiases.json`, use the `occ` command to propagate the changes through the system. This example is for Ubuntu Linux:

    $ sudo -u www-data php occ maintenance:mimetype:update-js

See Using the occ Command to learn more about `occ`.

Some common mimetypes that may be useful in creating aliases are:

image
  Generic image
image/vector
  Vector image
audio
  Generic audio file
x-office/document
  Word processed document
x-office/spreadsheet
  Spreadsheet
x-office/presentation
  Presentation
text
  Generic text document
text/code
  Source code

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