How can configure Mendelson directory running as a service?

I've a problem with the Mendelson software, the desktop aplication has a custom directory path Z: (Z: is a virtual disk) and it works, but when we close the desktop app and only let the service running, the service only takes the files in the C: (the service and desktop app is installed in C:) how can do than the Mendelson service takes the Z: directory?

Important: Z: is a filestorage, we can't install Mendelson here.

Desktop path directory: (Default on Mendelson)

C:/mendelson/as2/messages/
FileStorage path directory (Directory configured in desktop app and working but doesn't work in the service)

Z:/messages/
(Sorry for my english)

Thks for all guys!

Foren
AS2