Map a network drive letter to the Citrix Server where the app is located. In windows toolbar, select tools > folder options > File types > and scroll to DOC under extensions. Then click the Advanced button. In the Actions box, select "Open" and click on edit. In the application used to perform action: type in the complete path to the application on citrix. Then OK. This will open Citrix app when dbl clicking on a word document. I am assuming that Word is installed on the local machine and that the location of user word documents is on the local machine in the default location "My documents".
That should do it.
msmac67