Is there a way to use playlists (M3U) on the OSD?

[MaxPrdctns]

I can use M3U playlists on my PC to play movies.  Can you use an M3U playlist on the OSD to play movies?  What is the letter for a USB hard drive connected to an OSD?

I've typed up  a .txt file with all of the path/file name info on my PC and saved it as .M3U.  All of the files referenced are currently on drive C: on the computer.  It works on the PC but if the USB drive on the OSD has a different letter I would need to change that.

Also, is there a way to make a playlist directly on the OSD?

[heyrick]

I don't recall a playlist function for playing movies.

The storage device connected to the OSD is probably called something like /dev/sda1 for the actual device, and /mount/USB (I think?) for the filesystem.
As is obvious - it isn't DOS/Windows. There is no drive "letter".