Build and Shoot

Hi guys,
sorry if i make some grammar mistakes..
My English isn't the best :<<

My problem:
In game i can't hear some sounds, for example the footsteps or
the melody at the beginning of the game.
But the sounds are existing in the wav directory.
I tried to listem to them using the Windows Media Player, but couldn't hear nothing.
The sounds aren't muted or something and i can hear the rifle, smg or shotgun shot sounds too :/

I hope you can help me =)

Greetings,
LeFruit

Check if you have any 24-bit .wav files. Those things aren't that well supported, and must be downconverted to 16-bit.

How can i do that ?