I'm creating my own .ul file for managing Microsoft downloads with WUD. In my .ul file, I title each update with its KB article number first, in the hopes that WUD would list them by category from lowest KB number to the highest. This did not work. I also tried arranging the XML entries in the order I wanted them sorted, this did not work.

Q: How does WUD determine the sort order for the updates in each category?

EDIT: Just to clarify, WUD appears to sort updates by the publishdate, but I'm talking about when several updates were released on the same date, they do not seem to sort within date, by anything.

Yes, you are correct. WUD sorts ULs based on publishdate. At the moment, I haven't implemented a 2nd level sort, though I'm looking at a better way to implement navigation of the ULs to allow filtering as well as user controlled sorting.