# Dev/Environment/Viewer apps

From XOWA: the free, open-source, offline wiki application

Certain files are best displayed in dedicated third party applications. For example, a video file cannot be played natively in a HTML browser, but can be played in a media player.

## Using viewer applications

Viewer applications are generally activated in one of the following two situations:

- For audio/video files

  Click the play button in the article. This will launch the audio/video file in its viewer application

- For image files

  Click the thumbnail in the article. This will navigate you to its File page.
  Click the main image. This will launch the image file in its viewer application.

## Assigning viewer applications

XOWA assigns a file-type to its default viewer-application.

The applications use defaults defined in the config file:

If you wish to change the viewer application, you can do so in Options/Apps

## External links

Many articles will have external links. By default, clicking on these links will not result in any action. If you want the external links to open in a web browser, you will need to enable the web viewer application

If you wish to change the web browser, you can also do so in Options/Apps

## Recommended applications

This is a list of recommended open-source applications for each viewer type.

Internet
  Firefox
Images
  GIMP
Video/Audio
  VLC
DjVu
  DjVuLibre
PDF
  Sumatra (Windows)
  Evince

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