Hi Michiel > Let me put it like this. Until now, I've always been able to do this: > > \RequirePackage{expl3} > \RequirePackage{l3prop} > > But now, this gives me the error message: > > ! LaTeX Error: File `l3prop.sty' not found. correct. This is because we finally removed the individual .sty files. Initially, during the first phases of expl3 (when new datatypes got added and a lot got changed or updated within those datatypes) it was useful to have those as individual module files that could be loaded individually (and replaced for testing etc) but once things stabilized this became a problem as people loaded them in wrong order etc and we had to try to maintain all kind of dependency rules between the different files so that in the end normally most if not all of expl3 got loaded anyway. Therefore we announced way back that one should always load expl3 and not any individual files. and now we finally extract everything into a single file and the individual files only exist on the source level (just like LaTeX2e where you have many source files (.dtx) but only a single latex.ltx So I guess you have to bite the bullet and remove the calls to individual files as it really don't make any sense to provide empty .sty files just to support the above scenario regards frank