I developed an InfoPath Form Template in Visual Studio 2005, and signed it with a digital code signing certificate, and published it as a fully trusted installable .msi.
It was then installed on a Windows XP machine with Infopath 2007.
Later, a new version of the form template was published, the user tried to uninstall the old template file.
I'm a little fuzzy on the details here, and am trying to get more specifics, but the form had trouble uninstalling, and in the end some registry edits were required to uninstall the form.
While trying to install the new template version, the following error was displayed:
RegForm Custom Action Failure: The following form template cannot be registered: <Template file>
There is a problem with this Windows Installer Package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor.
Office Service Pack 1 was then installed, but did not resolve the error.