Organize supporting files in a folder

Supported on: At least Windows Server 2008 R2 or Windows 7

Registry

HKCU software\policies\microsoft\office\16.0\common\internet

Value name: donotorganizeinfolder

Enabled: donotorganizeinfolder = 0

Disabled: donotorganizeinfolder = 1

This will be forced on if 'Use long file names' is forced off.