Add xdg-open info

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+# Opening files with specific programs
+
+`xdg-open` looks up a file's mimetype, then determines which application to use
+to open it.
+
+The local database for applications to use is in `~/.config/mimeapps.list`. Need
+a `.desktop` file, which can be created under `~/.local/share/applications/`.
+
+## Setting defaults
+
+Easiest to do with `mimeopen` (from `perl-file-mimeinfo` on Arch):
+
+    mimeopen -d <file>
+    # will prompt to select a program from a list
+
+## Default browser
+
+The relevant mime types are:
+
+    x-scheme-handler/http=
+    x-scheme-handler/https=
+
+For qutebrowser, just copied the `.desktop` from [the repo](https://github.com/qutebrowser/qutebrowser/blob/master/misc/org.qutebrowser.qutebrowser.desktop).