InfoPath Dev

This should be easy and probably is, but it has killed my day.  

 I created an expense form in Infopath, that form gets routed back to me and my manager.   How do I get the form to open in Infopath and not a browser?  The document library is set as open in Client Application, but it is not working. 

 Am I supposed to be using Encoded Absolute URL or something else?   It opens in a browser and I want to force it to open in Infopath.

Thoughts?

I can't speak for your SharePoint workflow or what it does, but the first thing that comes to mind is checking that the form is a Client (and not Browser) form, and also checking that the library's Advanced Settings are set to open in the client. If the URL has a parameter such as OpenIn=Browser, try changing it to OpenIn=Client. Good luck.