[O] launching appropriate application from file link in org file

[Marc Croteau]

Hello,

Hope someone can help.
I have made a link to a file in my org file,
Many links call the appropriate application (for example, a link to a 
'.odt' launches the oowriter application.
For one specific file, a keePass file, Emac org simply tries to open its 
in fundamental mode (and it appears as a binary file).
I am able to launch correctly the file from the dired.  Note, however, 
that I have added code to my init.el to use gnome to launch the file.
My question:  can I somehow tell org-mode about how I want files of this 
type to be opened should I double-click them.

Hope my question is clear enough.

Thank you in advance.
Marc Croteau
Toronto