I have designed an Infopath Time-Off form in a MOSS 2007 site.
The workflow creates an Email to the user's manager, with a hyperlink to the form.
But when the manager clicks on the hyperlink, the form appears as 'raw XML'
in his browser, IE7.
If he navigates and clicks the same form in the library, it opens as a web page, no problem.
He's got contribute permissions on the library. The form is admin-approved.