Here is a recent message from new forum member JSW1735. This description clarfies the method using Windows Media Player.
http://forums.sandisk.com/t5/SanDisk-Clip-Sport-Plus/M3U-playlist-empty/td-p/358420/page/2
AND here is link to my current favorite method, the automated batch file command.
With a really helpful modification by new forum member TVRWM.
However, I must admit, sometimes I get really wild and just “shuffle all”.