I was excited to get the RTM of Office 2016 but dismayed that the Excel preview function did not work in Outlook 2016. Other previews were fine, like PDF and Word. I figured there must be a problem with the way that Excel 2016 was registered and tried a “Repair” and reboot but that did not help. Firing up Process Monitor showed the problem pretty quickly. The registry key for the Excel Preview handler is not the same as the other working handlers. Read More →