Differences between subscription types - help needed

I'm attempting to learn about Data Driven Subscriptions via Books
Online, particularly this tutorial:
http://msdn2.microsoft.com/en-us/library/ms169673.aspx, with no luck
thus far.
I have created essentially the same subscription as a non-data driven
one, and this successfully creates the file (rather than the email
mentioned in the tutorial). What could cause a data-driven subscription
not to work when an almost identical regular subscription does work? I
have tried both methods multiple times, with the same results.
Thanks in advance.This problem has been resolved. The local copy of that tutorial is
outdated, with the new version online. It makes values for a few fields
more explicit, and explores writing to a fileshare rather than to
email.