3rd Party App using Notes R7 on Citrix

Ok, what I have is

Lotus Notes R7 running on a Windows 2003 Server R2. We are publishing Notes to our clients through Citrix Metaframe Presentation Server 4.

The way I have installed Lotus is to have the program directory on the D:\ partition and then have the data directory on each users home drive (M:).

This all works fine except for the fact that we have another application that uses the nlsxbe.dll file to send mail through Lotus Notes.

If I move the data directory onto the server (D:) it works fine but the moment you move it back to the home drive it fails.

Has anyone seen this before? How can I get the nlsxbe.dll to look in the users home drive for the notes.ini file?

Any help would be greatly appreciated