The following info taken from my XML file on my Nuvi 2350.
DataType>
<Name>trafficTrendsv2</Name>-
<File>-<Specification>
<Identifier>HTF</Identifier>
</Specification>-
<Location>
<Path>.System/SQLite</Path>
<FileExtension>db</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection