File MIME
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Drupal determines the MIME type of each uploaded file by applying a MIME type mapping to the file name. The default mapping is hard-coded in ExtensionMimeTypeGuesser (Drupal 8), file_default_mimetype_mapping() (Drupal 7) or file_get_mimetype() (Drupal 6).
The File MIME module allows site administrators to alter the built-in mapping. For example, you may wish to serve FLAC files as audio/flac rather than application/x-flac.
On the File MIME settings page, the MIME type mapping can be extracted from the server's mime.types file and/or configured via a text field, and on Drupal 7 and Drupal 8, can also be applied retroactively to all previously uploaded files.
In Drupal 7 and Drupal 8, disabling this module will restore Drupal's built-in mapping. In Drupal 6, uninstalling this module will delete the mime_extension_mapping variable, thus restoring Drupal's built-in mapping.