# Recoll user manual
Configuration overview

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### The mimeview file

`mimeview` specifies which programs are started when you click on an Open link in a result list. Ie: HTML is normally displayed using firefox, but you may prefer Konqueror, your openoffice.org program might be named oofice instead of openoffice etc.

Changes to this file can be done by direct editing, or through the recoll GUI preferences dialog.

If Use desktop preferences to choose document editor is checked in the Recoll GUI preferences, all `mimeview` entries will be ignored except the one labelled `application/x-all` (which is set to use xdg-open by default).

In this case, the `xallexcepts` top level variable defines a list of MIME type exceptions which will be processed according to the local entries instead of being passed to the desktop. This is so that specific Recoll options such as a page number or a search string can be passed to applications that support them, such as the evince viewer.

As for the other configuration files, the normal usage is to have a `mimeview` inside your own configuration directory, with just the non-default entries, which will override those from the central configuration file.

All viewer definition entries must be placed under a `[view]` section.

The keys in the file are normally MIME types. You can add an application tag to specialize the choice for an area of the filesystem (using a `localfields` specification in `mimeconf`). The syntax for the key is `mimetype``|``tag`

The `nouncompforviewmts` entry, (placed at the top level, outside of the `[view]` section), holds a list of MIME types that should not be uncompressed before starting the viewer (if they are found compressed, ie: `mydoc.doc.gz`).

The right side of each assignment holds a command to be executed for opening the file. The following substitutions are performed:

- %D. Document date

- %f. File name. This may be the name of a temporary file if it was necessary to create one (ie: to extract a subdocument from a container).

- %i. Internal path, for subdocuments of containers. The format depends on the container type. If this appears in the command line, Recoll will not create a temporary file to extract the subdocument, expecting the called application (possibly a script) to be able to handle it.

- %M. MIME type

- %p. Page index. Only significant for a subset of document types, currently only PDF, Postscript and DVI files. Can be used to start the editor at the right page for a match or snippet.

- %s. Search term. The value will only be set for documents with indexed page numbers (ie: PDF). The value will be one of the matched search terms. It would allow pre-setting the value in the "Find" entry inside Evince for example, for easy highlighting of the term.

- %u. Url.

In addition to the predefined values above, all strings like `%(fieldname)` will be replaced by the value of the field named `fieldname` for the document. This could be used in combination with field customisation to help with opening the document.

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