Both of your questions are addressed in the beta section...
http://www.kixtart.org/forums/ubbthreads.php?ubb=postlist&Board=3&page=1

First question. Will likely be fixed in the next build.
http://www.kixtart.org/forums/ubbthreads.php?ubb=showflat&Number=206102#Post206102

Second question. Kix does not rely on any dll. It has to do with the Visual Studio the exe is built with. Right now I believe Ruud is building the exe with VS2010 which supports XP and up.
http://www.kixtart.org/forums/ubbthreads.php?ubb=showflat&Number=202974#Post202974