Is MediaLab 2004 able to display *.htm files if Office 2007 / IE 7 is installed (as opposed to Office 2003 / IE 6, which does work)?

I just installed MLv2004 on a machine with Office 2007 and IE7, and the first question I come to which uses a custom form .htm displays as blank. I'm wondering if it might be due to Office/IE, or is another problem entirely.

Thanks,

Jon