Please describe the problem:
A few releases ago, AFAIR, changing the default application used to open a file type results in gnome-open / xdg-open picking up the change. Now, however, if I change the default application for, say, AVI files to VLC, xdg-open / gnome-open / Thunar still opens the file using Totem.

Changing the association in Thunar, on the other hand, does the right thing: xdg-open and gnome-open opens the file in VLC. Nautilus appears unaffected by the change.


Steps to reproduce:
1. In Nautilus, open a file's Properties->Open With dialog and change the default app
2. In Thunar, change the same file's default app to something else
3. xdg-open the file in a terminal


Actual results:
The Thunar setting is respected by xdg-open, the Nautilus setting does not interact at all with all the other applications

Expected results:
All applications should be modifying the same MIME settings

Does this happen every time?
Yes

Other information: