264 file extension identifies video encoded with AVC /MPEG-4 (Advanced Video Coding) video codec. However, 264 is not current used file extension for H.264 video, much more are used file extensions like MKV, FLV, MP4, M4V, BSF etc. When you actually perform 264 to wmv conversion, final video quality can be decreased, because WMV format doesn't allow some features exclusive to H.264 codec.
Open 264 file Open WMV fileConverter of roprietary H264 encoded video from an entry level Alien or AlienPro DVR into WMV, AVI or Real Media files
A free video converter offering high-quality conversions between many video formats