AIS processing. GNURadio

Hello!
I have an AIS signal receiver circuit (https://oz9aec.net/radios/gnu-radio/a-2-channel-ais-receiver-using-rtl-sdr-and-gnuais ). Please help me change the scheme for processing .wav files. I attach the signal recordings (https://sdrplay.com/resources/IQ/ais.zip).
Thank you very much!