For those of you who are not familiar with command-line operations, 
here is how to use the sox program from windows.

1. download the "sox12181" zip file from SourceForge. Unzip and
extract the sox file to a directory of your choice.

2. In windows: click start-> All Programs -> Accessories -> Command Prompt.  
A Command Prompt window should pop up.

3. Move to the directory where you have the file sox.exe.

4. Place your .wav or .dat files in that same directory.

4. In Command Prompt window, type:

    sox secret.wav secret.dat 

5. Now you should see the converted file secret.dat in the same directory.