That folder is created automatically when we run the chkdsk scan or possibly another disk checking utility. When errors are found such as lost clusters on your drive, Windows will fix the errors but depending on whether or not you have chosen to convert lost clusters or chains to file, windows will create these folders sequentially starting with .000.
The folders contain files with names File0000.chk, File 0001.chk and so on. These file are created to save any lost data during the chkdsk fix.
Probably you havent safely disconnected your nuvi from windows, or something similar.
About 13xx instead of 1300 ,it means you lost your model number in Non Vol memory.
Check your Garmin device.xml ,as said in another thread. Please for help post in Firmwares section.