Post your code - in code tags using the </> icon.
The WAV file is corrupt - something wrong with the header. Goldwave says that it is 8-bit sampled at 16kHz.
But the audio is obviously totally screwed. The audio of your voice only occurs as negative samples interspersed with regular clicks. My guess is that the clicks are caused when the data are written to the SD card. Perhaps the card can't keep up with the sampling rate of 16kB/sec. But you need to post your code.
Pete