There are 3 links under Mitel Comminucation Director --> MCD 6.0 SP1-12.0.1.24 for 3300 ICP platforms and MXe server:
DHCP_Config_Helper.zip
DHCP Config Helper Document; or
Option 125 Config for window 2003
The top 2 work just fine in Firefox (in IE only when opening in new tab), the last gives me this error message:
Error 404
HTTP Web Server: Lotus Notes Exception - Entry not found in index
I wrote to Mitel on Friday, hopefully they will fix it soon.