Gnome open can not recognize a file by its name

[mond <mondzhu@gmail.com>]

Hi,

Recently, my gnome failed to recognize any file by its name extension.
For example, I have a .odt file but gnome fails to open it with
openoffice writer. So every time I want to open .odt file I have to
use "open with other application" option. It is annoying. Gnome also
fails to display the correct icon for a certain file.

I think it is due to a recent careless dist-upgrade. This issue maybe
caused be some components of gnome or nautlis removed.

Any idea how to fix this problem?

Thank you in advance.

Mond Zhu