Possible Duplicate:
Add custom command in the open with dialog?
I would like to open e.g. webm files using mplayer, but it is not available in the "Open With" dialogue and (quite frustratingly) the dialogue no longer allows selection of the program to use from the file system.
Is there a conf file I can edit directly to get this done?
If you'r using 11.10 i found this for an application called nedit.
Quoting mc4man
If, in other hand, you're using 12.04 you can do it like this:
There will be one more option like open with other application , select that . a window will open with browse option and navigate to usr and then to bin folder and there you can select the application you want .
I am using KDE and i will post those images and i hope they will help you to understand .