How to convert .wav files to .bik format.
Converting WAVE Audio Files directly to Bink Video Files (.wav to .bik conversion) should be possible, even though your options are quite limited.
It appears that your best option is using the Freemake Video Converter, which should be capable of converting WAV to BIK.
Alternatively, you can try some available online conversion solutions, which claim to be capable of such conversions.
One of the most popular and successful free video conversion softwares