WiX 3.6: A Developer's Guide to Windows Installer XML

Registry permissions

Every key in the registry has a set of permissions saved to it that affects which users can read or write to it. You can see this in the Registry Editor by going to Run | regedit, right-clicking on a key, and selecting Permissions. WiX allows you to change these permissions with its PermissionEx element.

PermissionEx isn't in the default WiX namespace, but rather in WixUtilExtension. So, you'll need to add a reference in your project to WixUtilExtension, found in the WiX bin directory, and add the UtilExtension namespace to your Wix element. Here's the updated Wix element:

<Wixxmlns="http://schemas.microsoft.com/wix/2006/wi" 
xmlns:util="http://schemas.microsoft.com/wix/UtilExtension">

We've assigned the UtilExtension namespace ...