MID is a sound file format developed by the MIDI Manufacturers Association and is a standard extension for MIDI (Musical Instrument Digital Interface) audio files. Using files of the specified format, the encoding into the standard format of most MIDI data is performed. This standard format is used for the interaction of various devices and programs. The exchange of musical information is between instruments, synthesizers and computers. MID files do not contain the musical data itself, but their attributes - for example, information about how long certain notes sound, or about the pitch, tonality.
WMV is a common video file format developed by Microsoft and designed to store or transfer video data. It takes its name from the abbreviation of the name of the Windows Media Video technology itself, with which the file is encoded. Codecs for WMV format are installed automatically along with any version of the Windows operating system. Playing WMV files is possible on almost any media player. Such files may contain both Windows Media Video video data and Windows Media Audio audio data. The format also supports the use of DRM protections to prevent copying.