Left and right channels reversed when playing .WAV files

SanDisk MP3 players Sansa® Clip | Sansa® Clip+
13

Here are the files:

http://files.sansabug.webnode.com/200000001-bf2e7c028a/L_REV_1.WAV

http://files.sansabug.webnode.com/200000000-8c8678d017/L_REV_2.WAV