# Recoll user manual
Examples of configuration adjustments

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#### Adding an external viewer for an non-indexed type

Imagine that you have some kind of file which does not have indexable content, but for which you would like to have a functional Open link in the result list (when found by file name). The file names end in `.blob` and can be displayed by application `blobviewer`.

You need two entries in the configuration files for this to work:

- In `$RECOLL_CONFDIR/mimemap` (typically `~/.recoll/mimemap`), add the following line:

      .blob = application/x-blobapp

  Note that the MIME type is made up here, and you could call it `diesel/oil` just the same.

- In `$RECOLL_CONFDIR/mimeview` under the `[view]` section, add:

      application/x-blobapp = blobviewer %f

  We are supposing that `blobviewer` wants a file name parameter here, you would use `%u` if it liked URLs better.

If you just wanted to change the application used by Recoll to display a MIME type which it already knows, you would just need to edit `mimeview`. The entries you add in your personal file override those in the central configuration, which you do not need to alter. `mimeview` can also be modified from the Gui.

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