Open file with unlisted application in ubuntu 12.04

In ubuntu 12.04,
While browsing files in nautilus, if we want to open file with unlisted applications, for e.g. open a file with idle(but idle is not listed in the list of open with ). Enter the following command in the terminal:

gksudo gedit /usr/share/applications/idle.desktop

Then remove the line:

Exec=/usr/bin/idle -n

Replace it with:

Exec=idle %U

Now we can see idle listed in the list of open with applications.

To set it as default application to open a file.
Go to the file properites, select idle and click set as default.

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