Microsoft Image Composer files are generated by the Image Composer program. Microsoft will not release specifications for this format, so we had to figure it out ourselves.
ThumbsPlus can read all MIC files that I've encountered; however, I have no way of knowing if my knowledge of their format is complete.
|•||All IC sprites are flattened into a single image (alpha channels are processed during the flattening).|
|•||Sprite gamma values (which cause numerous color-matching problems in IC itself) are ignored.|
|•||For quick identification purposes, the file extension of MIC files must be .MIC.|