Hi Ernesto,
thanks for your quick reaction. I thought that it had to be something on my setup, because I've seen Patrick using qRules in Win7 during the Master Class.
OK, I've followed your suggestion. I think in my case the culprit might be that I have Office 2010 and Office 2013 installed side by side.
I checked the installed features and the ".NET Programmability Support" is enabled.
I did a repair install of Office 2010, but still no bacon.
Then I did a repair install of Office 2013. Now, from the Start Menu > Qdabra > etc ... the SharePoint mapping tool opens in IP 2013. No error messages. Seems to work.
When I manually open Filler 2010, navigate to the form and open it, I get the message that it cannot be opened because the .NET framework 3.5 is not installed. Maybe there's a conflict between .NET 4 and 3.5? Or 2010 and 2013?
When I start Designer 2010 an open the form, I get a message that the form is in use and whether I want to open a read-only copy. How can the form be in use if it's not opened in another process?
The same goes for the sample qRules form, by the way.
What do you think: can I run the mapping tool with IP 2013 to create a valid mapping.xml? If so, I'll take that as a workaround. If I can use qRules in the 2013 interface with no drawbacks on functionality, that'll be fine.
I'll play around some more and will report findings as I go.
cheers, Ingeborg