Some time ago, we blogged about the reasons why you'd use UDC files and the anatomy of UDC files. You may be wondering, however, if it's possible to author these files in InfoPath - after all, UDC files are just XML files.
You're right - this is definitely possible. Attached to this article is a form template that lets you author and edit UDC files. Here are the steps you need to take to make it work:
1) Download the attached form template, save it to your desktop
2) Right-click on the downloaded .xsn file, then select Design. Ignore any warnings about the published location.
3) Go to File | Publish | Network Location, and republish the form template. Then open the form template from its published location.
Enjoy, and let us know if you have any feedback on the tool.
Lead Program Manager
Software Design Engineer in Test