Dora La Exploradora Doblaje Xavier Free -

I should also consider that "Xavier" could be a common name, so there might be multiple people named Xavier who have done voice acting for Dora in different regions. However, the user probably refers to a specific one. Maybe in a certain country's version, Xavier is known as the voice of Dora or another character, and the dub is considered "free" as in publicly available or open access.