I'm not sure if this is relevant but by default the batch would run as the localsystem account and would probably not have access to UNC share(s).
Perhaps you should include the files in your package or make them available via http?
Message was edited by: Doc
even with an HTTP: share, it didn't seem to work. I also tried adding all the other files as additional files. Maybe the next step is just biting the bullet and copying down all the additional files to the local machine.
Are these additional files sitting on your core?
You might want to search the forum for "Null season Share" see this article for example http://community.landesk.com/support/docs/DOC-1564.
Alternatively you could deploy using OSD, this allows for allot of control and let's you map drives.
I have used OSD for some of my more annoying distributions and it works rather well once you get used to it.
Short of this you might have to check your logs to see if you can find more details about what's going on here.