This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Edit...I looked back at the test cases that were created and executed for IE7. There is a test case that involves uploading files and that case passed with IE7. I would research the changes in IE7 (I think there is a decent document on the Microsoft site) and see which ones apply. If you find anything out please post back as I would be interested...much better to find out now then after the end users start installing IE7!