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My system is Gentoo amd64, with Gnome3. I found some of the files/actions are associated with the wrong program.

e.g.: when I plug in my usb drive, the associated program is RawTherapee, a raw image processing tool, instead of the nautilus.

How can I fix it?

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Have you tried right clicking -> properties -> open with? – soandos Aug 12 '12 at 9:10
Definitely I can do that. But that is less ideal. I would like to have the most used program being associated with the files/actions. – davidshen84 Aug 12 '12 at 9:53
It will hold for the whole extension, not just that file – soandos Aug 12 '12 at 9:53
Thanks. But this only works for files. I am also having trouble with devices, like when plugging in a USB disk. :) – davidshen84 Aug 12 '12 at 9:56 – soandos Aug 12 '12 at 10:48
up vote 1 down vote accepted

Associating most used types of files with applications in Gnome 3 is done through

System Settins >> System >> Details >> Default Applications

In the same pane you have "Removable Media" where you can "Select how media should be handled".

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The way to do this is by right clicking -> properties -> open with...

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