It's a user-edited prefs file. Just put it on the card, and adjust in Notepad...
Graphics:
PLAY_YAN_Design=1 (default: 0)
0:default  1:Arrange
Bass boost on/off:
PLAY_YAN_AudioBass=0 (default: 0)
0:Bass eff  1:Bass on
Default playback mode:
PLAY_YAN_StartMode=1 (default: 1)
0:Movie  1:Music
Surround effect (Music mode)
PLAY_YAN_AudioWide=0 (default: 0)
0~6(bigger, the bigger effect)
Volume boost:
PLAY_YAN_VolumeAdd=0 (default: 0)
-18~9 (bigger is bigger boost)
Play mode (movie mode)
PLAY_YAN_VideoPlayMode=0 (default 0)
0:Play selected
1:Loop selected
2:Play all
4:Loop all
Play mode (music mode)
PLAY_YAN_AudioPlayMode=0 (default 0)
0:loop all tracks 1: loop 1 track
2:shuffle 4:play all (no loop)
Brightness (movie mode)
PLAY_YAN_VideoBright=0 (default 0)
0~5(higher is brighter)