I take it that you want to open that excel file in Excel or whatever default application has been specified for files of that type?
Clicking the container field would not normally do anything like that. Perhaps you have inserted the file by reference and are double clicking the container field?
If so, a script can use Go to Field with the select/perform option and specifying the container field (which must be present on the layout) in order to open that "by reference" file in the container field.
Thanks for the help. It works great. Thank you !!!