Songs not visible in my computer m250

Used to have an M230 and I was able to plug in top the usb port and in my computer used to see the individual tracks. Now all I see are folders with nothing in them: Config, Record, and Audible (in MMC). When I put the usb setting to auto on the device I dont see anything in “my computer” but I get an option to sync player to WMP Win-Amp etc…
I would just like to back up my songs so I can put new ones.