jodybingo is correct, although it wasn't intended to be something you should modify. The copying occurs to put updated files into your data store. It's part of a migration of the TD originally having everything in the Program Files location (including your saved data) to it being in the "Documents" location. But even now that it's not really necessary to "migrate" that stuff, the included templates have to get copied out to your data store or else they would be far less accessible.
Anyway, you certainly can modify that file to prevent the TD from copying files to your Data Store. But be aware that any NEW files in an updated version of the TD won't get copied, either.