pdf attachment to fax

Hi All,
My setup: win server 2003 sr2 with xp pro clients all fully patched
and up to date.
Clients are faxing useing outlook through the server using windows fax
serivce.
Pdf attachments were faxing fine so long as I set the printto verb to
"....AcroRd32.exe" /t "%1" "%2" "%3" "%4" "
The problem is that I just updated adobe acrobat reader to version 8
(from version 7) and now when I try attaching a pdf acrobat opens up
but I get an error message saying "There was an error opening this
document. This file cannot be found."
any help is greatly appreciated.