1.) Download sox.zip and extract to whatever folder you want to convert your files in (ie: the directory your project is stored in).
2.) Open up command prompt: click start-> All Programs -> Accessories -> Command Prompt.
3.) Change directory to where you stored your extracted sox [quick dos commands: 'cd "[directory]"' -> change directory (use double quotes around the directory name if there are spaces in it), 'dir' -> list files and folders in current directory]
4.) Copy secret.wav into the extracted folder.
5.) In the command prompt window, type: sox secret.wav secret.dat
6.) You should now see secret.dat in the folder you extracted sox in.