The <driver>.o file needs to be included on the second Linux boot floppy. Be aware that there is a bug in the boot disk builder. You will need to modify manually the settings.txt file to remove the UNC/path to the <driver>.o file.
The following drivers are included in this zip file.
This article includes a nice collection of tools that will help you use ZENworks for Desktops 3 Imaging with Linux. Here's what you'll find: