Hi Pascal,

No, a REG file will not do. Graham's point is that there is only one binary
(bit-mapped) value in the registry that contains a great many user
customization settings. The structure of that value is not publicly
documented. I don't know of any way to change only one setting within that
value by any means external to Word.

If you overwrite the value for all users with one value from a REG file, you
will destroy a great many other customizations that users may have spent a
lot of time setting up.

What Graham suggests, and I concur, is that you should use a VBA macro to
set the option, and that will alter the registry value without disturbing
other customizations. That macro could be an AutoOpen macro in a global
add-in/template that you distribute to all users, so it will execute every
time a user opens any document.