How to convert .bik videos to .wma format.
Converting Bink Video Files directly to Windows Media Audio Files (.bik to .wma conversion) is possible and should be quite straightforward, even though your options might be somewhat limited.
Use, for instance, the Freemake Video Converter, which allows users to easily convert .bik to .wma.
A video conversion utility
One of the most popular and successful free video conversion softwares