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"The application persists the tags in the file names."

That implies that it renames your files for you - can someone who's used it confirm this?

yes, that is exactly what it does. It adds your tags inside of square brackets at the end of the file name before the extension.

It's built in node-webkit [1] though, so it wouldn't (shouldn't) be too hard to integrate websql, sqlite or some other database [2].