It seems that .264 files stores both video and audio content, but .wma files (Windows Media Audio) are typically used for audio data only, which means 264 to wma conversion is audio only. Such 264 to wma is conversion is often used by users who have mobile recordings from live concerts, live DJ sets etc. in 264 video files and need them to play as audio tracks in portable multimedia players, or mobile/smart phones.
Open 264 file Open WMA file