On Windows 10 and Windows Server 2016, Microsoft introduced a new security mechanism to check settings of default applications in the registry. Occasionally, the Windows Profile Service changes the security settings of the user registry entry. As a result, the settings of default applications are reset to Microsoft recommended defaults.

When testing Windows 10 and Windows Server 2016 without a VDA installed, this issue does not happen. Citrix is working with Microsoft to provide a long term solution. In the meantime, use the following workaround to avoid this issue.

Follow the steps below to delete the path from the default folder exclusion list:  

1. Log off all active sessions.

2. Delete the following item from the exclusion list: Software\Microsoft\Speech_OneCore=

3. Run the gpupdate /force command to apply the change. For more information about the gpupdate command, see Gpupdate.

For details about configuring exclusion list and inclusion list, see To include and exclude items.