[Discuss-gnuradio] Cant receive .wav file correctly

I have made a flow graph using GRC to transmit a text file, and it worked fine.

I used dqpsk mod and demod and packet encoder and decoder.

The text file sent is successfully received at the file sink.

But when i send .wav file i dont receive anything at the wav file sink, other than a 0 byte .wav file.

Where am I going wrong?

http://imgur.com/V1e59Kv