today i put in MIX file with XCC Mix editor
about 3.5 GB of files (all multimedia, movies)
and end result was compressed up to 1.6 GB

so my question is what type of compresion MIX files do use ?

btw this is from your page of MIX explanation:
"MIX files are used to store other files, in the same way as ZIP files, but without compression."

seems to me it does use very good compression