openwith /

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Openwith is a simple but very useful package to make Emacs associate various file types with external applications.  For example, Emacs can open PDFs, but you may want to open them with a dedicated PDF viewer instead.  With openwith, you can do this seamlessly when you use C-x C-f.  It also works with recentf and ido.

Here's an example configuration for your init.el:

    (when (require 'openwith nil 'noerror)
      (setq openwith-associations
             (list (openwith-make-extension-regexp
                    '("mpg" "mpeg" "mp3" "mp4"
                      "avi" "wmv" "wav" "mov" "flv"
                      "ogm" "ogg" "mkv"))
             (list (openwith-make-extension-regexp
                    '("xbm" "pbm" "pgm" "ppm" "pnm"
                      "png" "gif" "bmp" "tif" "jpeg" "jpg"))
             (list (openwith-make-extension-regexp
                    '("doc" "xls" "ppt" "odt" "ods" "odg" "odp"))
             '("\\.lyx" "lyx" (file))
             '("\\.chm" "kchmviewer" (file))
             (list (openwith-make-extension-regexp
                    '("pdf" "ps" "ps.gz" "dvi"))
      (openwith-mode 1))

See also
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.