Cannot fax a tif file attachment with Outlook 2003 using SBS 2003 Fax Services

Within Outlook 2003 I am trying to sending an email to a fax contact
with a TIF file as an attachment.
I get the following response

The Microsoft Fax transport failed to deliver the message to the
recipient.
The message body cannot be printed

If I do the same with a TXT file attachment it works fine.

I understand that this will only work if there is a printto verb for
the TIF file association, the one I am using is ...

rundll32.exe C:\Windows\system32\shimgvw.dll,ImageView_PrintTo /pt "%1"
"%2" "%3" "%4"

Configuration :
Server - Windows SBS 2003
Client - Outlook 2003 on XP SP2

Any ideas gratefully received