Microsoft has recently announceed that is is discontinuing development of its MSAgent technology (http://www.microsoft.com/msagent).  In light of that news, I have decided to release my latest MSAgent data spec sheet, which I have been holding on to for several years, as it now includes full details about MSAgent's compression algorithm, as well as adds new information about the ACF and ACA file formats.  I was not sure how Microsoft would react to the compression information being released publically.  However, since they are not developing MSAgent any further, I figure it should be safe now.  Other people are already starting to implement their own MSAgent replacement engines, so my latest spec can be helpful for them.  I am still planning on working on my own MSAgent-related projects, as described in earlier mailings and on my website.  It is just a matter of having enough free time to do so.