How to change default application associated with some mime types?

When we install some new program, for example GIMP, I assume the newly installed program is added to some mime type database, and the /usr/share/applications/mimeinfo.cache file is automatically generated.
Using my example, GIMP will be the default application for all its registered mime types, even application/pdf. I surely don't want this to happen, and I surely don't want to create all kinds of files that GIMP registered and right click on them and choose Properties and then change it in the Open with... tab. I want to systematically de-prioritize GIMP so that it will not override my previously assigned default applications.
I wrote a script to modify the mimeinfo.cache file, and it seems to work great. However, after a reboot or upgrade or something I didn't notice, the default application of application/pdf is reconfigured to GIMP. I think the cache suffix of the file indicates that it is just a cache and may be changed by system unnoticed. So I am looking for a new way to change the default applications.
As far as I know or guess from the phenomena, there should be some system utility that generates the mimeinfo.cache file, it seems to parse all the *.desktop files under /usr/share/applications and register them to certain mime types accordingly. The sequence of the *.desktop files get parsed seems to be related to the time the application is installed, and the newly installed applications seems to be parsed later and inserted in the front of the application list or be parsed earlier and appended to the application list. Is there some place I can change the sequence of the parsing? Or is there some place I can change the behavior of the system utility?
I know that I can populate my ~/.local/share/applications/mimeapps.list to override the system wide defaults, however, I want a more elegant way to this.
Any opinion on this is welcomed.
Last edited by AugustePop (2010-05-14 05:47:15)

Ah, right. Don't know what DE you are on, but in Gnome: right-click a (e.g. pdf) file -> Preferences -> Open with.
All Applications listed there will be available from the right click menu, the marked one will be used on double-click.
errgrh...
I surely don't want to create all kinds of files that GIMP registered and right click on them and choose Properties and then change it in the Open with... tab. I want to systematically de-prioritize GIMP so that it will not override my previously assigned default applications.
I guess what I am trying to propose is this: "de-prioritize" GIMP in its .dekstop file for the types you dont want it to be associated with, and manually add it back in through "Open With" for the file types you want it to be an option. Not sure if this is solving anything for you though
Last edited by hokasch (2010-05-14 10:28:57)

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