We have found one software suitable in our database for this conversion.
Some multimedia converter programs like the Freemake Video Converter supposedly support BINK format (.bik) and can convert it to other multimedia files or can be used to extract and save the audio tracks.
So it should be possible to convert bik to wma using this software, however BINK videos (especially those older from computer games) do not contain audio track in them so this conversion would make not sense. The audio data were typically saved in separated audio data files.
BIK
Files with bik extension can be most often encountered as video files encoded using the special Bink and Smacker codec. Typically encountered in older computer games.
WMA
Files with wma extension are audio files in Advanced Systems Format (advanced Streaming Format, Active Streaming Format), which is multimedia container format sed to store multimedia data. A wma file stores audio in Advanced Systems Format container and compressed by Windows Media Audio (WMA) codec.