My site uses data uri:s to reduce the number of HTTP requests to my site. The problem is that data uri:s don't work in IE7, a browser that we have to support (No, we don't need IE6). I've followed [Stoyan's guide](http://www.phpied.com/the-proper-mhtml-syntax/) and actually gotten it to work, but after a recent Microsoft security update (KB2544893, as descibed in a [comment on the original article](http://www.phpied.com/the-proper-mhtml-syntax/#comment-78586)) the fallback seems to have stopped working. 

The comment referenced above suggests I should try sending the MSHTML file with Content-Type message/rfc822, but I can't get this to work either, and I've tried multiple different ways over a course of several hours.

**So my question is this**: Can you get the technique described by Stoyan to work somehow? I would really appreciate a working example to convince me that it truly is possible.