Server 2012 r2 Deduplication and Windows XP

I was having issues with Windows XP clients not able to open xls, bmp, etc files on a volume that had been deduped. Windows 7 clients had no issue at all. It ended up being tracked back to enableecp registry entry

Very last post talks about enableecp and vipre

https://social.technet.microsoft.com/Forums/windows/en-US/c3f370ec-cca3-4af5-90a4-02c2a8901bc8/windows-2012-deduplication-access-share-from-windows-xp-7?forum=winserverfiles

This article describes what the enableecp key does.

https://support.microsoft.com/en-us/kb/2817216

I was able to change HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters\enableecp to 0 on the file server and restarted the server service and now the XP client isn’t getting any error messages on opening up files.

Note: This key is not on server 2012 by default .