Great, the important thing is to solve....I personally use the precomp042 and 043, substantial differences between the two, the precomp042 has a greater compatibility of compression with data files and with the various application for decompression,on the contrary, with 043 you could get errors of incompatibility on some files, during the compression, but you get more compression as unlike to the 042.
the other information you can read here
http://schnaader.info/precomp_changes.php