Why not send an executable attachment like in the extended notification? use 'SWN_CREATE_SHORTCUT' function module. It returns a shortcut string which you can attach to the mail as a file and it's very small, no need to save the file on each workstation. this way you can try to add a link to a specific document and not to FB03 in general.
Here you can see the shortcut parameters: Creating an SAP Shortcut (SAP Library - Getting Started - Using SAP Software)