# ownCloud 9.0 Server Administration Manual

# Mimetype aliases

ownCloud allows administrators to specify aliases for mimetypes. This makes it possible to show more specific icons for certain mimetypes. Take as an example audio files. It is nicer if they show a nice audio icon instead of the default file icon.

By default ownCloud is distributed with `config/mimetypealiases.dist.json`. Administrators should not modify this file, as it will be replaced when ownCloud is updated.

## Adding custom aliases

Custom mimetype aliases can be added to `config/mimetypealiases.json`, using the same syntax as `config/mimetypealiases.dist.json`. 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

Once you have made changes to `config/mimetypealiases.json`, run the following to propagate the changes through the system:

    $ ./occ maintenance:mimetypesjs