MSC mode - no files

I set my Clip to USB mode of MSC.

I connect it to the pC, and windows explorer shows up with all the folders in the device, but no one single music file listed, but the device has 250 songs stored in it ?

What is up with that ?

How can see what is inside the device via windows explorer ?

First page of that thread has some well detailed descriptions of the mode.  Including the solution to your problem.

Short version is that each mode only sees the files that were placed while in that mode.  So if you’re staying with MSC, switch over, clean out the files, switch back to MSC and fill her up.  If you’ll be switching back and forth (to deal with DRM) then you just have to deal with not seeing files from the other mode.