If you use 64bit Windows & 32bit Office, the key is Version supplied in an MSDN subscription, the keys you need to change are as

If you are using the volume license 'MSI' or installed Office using the

HKEY_LOCAL_MACHINE\​SOFTWARE\​Microsoft\​Office\​ClickToRun\​REGISTRY\​MACHINE\​Software\​Microsoft\​Windows\​CurrentVersion\​PreviewHandlers The correct registry key for a click to run installation used by Office 365 subscribers and retail purchasers (which covers most users) is: Affected users can fix it now by adding the following values to the registry. This is due to an incorrect registry entry for the preview handler.