Hi
I don't remember, it was a pic18F2550, I buffered 32 bytes at a time to the PC and the PC saved all the bytes, when the recording was done the PC converted it to a WAV file.
The PIC only streamed the audio to the PC.
I wroted code in C Builder to write the buffer to a file and then used a WAVE Module by Timothy J. Weber. to conver it to a wav file,
I did the project in 2007 You will have to goolge for the module.
Hope that helps
Regards