Convert Avi To Mkv
you can easily convert any AVI file to MKV file with Free tool
you need RipBot264. It is a FREEWARE so u can download it here:
1.Click on Add button
2. You can limit your file size
3.click to begin encoding and Done !!
http://how-2-do.blogspot.com/2008/02/how-to-convert-avi-to-mkv.html