MKV comes from Matroska video  Matroska is the extensible open standard Audio/Video container like
avi  mp4  mpg  asf  rm  mov.
MKV TO AVI CONVERTER can convert mkv to avi file. MKV to AVI converter is also an MKV converter 
splitter and editor.
It changes the frame size  frame rate  video compression codec and audio compression codec. The key
features include:
Encode AVI with DIVX  XVID  Windows Media Audio and Video Codec  DV Video Encoder  etc.
Split mkv file into smaller pieces.
Adjust the video aspect ratio. Change video file size with choosing the different encoding
bitrate.
Open compression system for video and audio. Convert
Other video formats MPEG  MPG  ASF  WMV  VCD  SVCD  DAT to avi file also.
Here are some key features of  MKV to AVI Converter :