The main file is called "cath.dat." As it is quite complex, it make take a long time to load. If you have an older parts library, you may experience problems, especially with part 6002 (6x6x9 "Paradisa" curved trans panel). If you have a problem with this part, then get the latest parts update from www.ldraw.org and re-run mklist.exe. If you still have a problem, then check out www.lugnet.com and go to the lugnet.cad.dat.parts group and search for "6002." Unfortunately, you must load this part, a sub-part file, and several primitive files. Brad Hamilton bhamilto1@home.com