How do I set the default image viewer for ranger file manager?

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http://crunchbang.org – @kbmonkey -> Remove line no. 135 from your config c.flags += 'd' Also make sure you have at least one of these apps ('viewnior', 'sxiv', 'feh', 'eog', 'mirage') ? . I see you are using older version of ranger(1.5.xx) .... new version(1.6.xx) don't use apps.py file but rather rifle.conf. It is better to upgrade to newer version which comes with lots of bug fixes and simpler config files which is easy to understand. The latest version of ranger is available in debian sid and debian backports repos. (HowTos)