It sems that the Key you show refers to "9.0\C ommon". Notice the space. There should be no spaces in reg keys and also the 9.0 may refer to old software. My PC registry only shows 15.0 and 16.0. For a modern Office version I would have expected reg changes to apply to 16.0 subkey.
You are correct not to attempt registry changes unless you are sure what you are doing since you could wreck your PC.
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