I've had a Garmin 1350 for some time and it has helped guide me around the country in my RV, even with decade-old map data. In the process of going through my hard disk backups I notice a 2.16GB file garmin_rmu_cnnant2010_30.exe which I presume is a Garmin Express installer and 2010 map repository. Is this file still useful to keep and what are the implications of deleting it? I would really like to recover the archive space if it is not. Thanks!