Yes, this is exactly how it works. Both conversions (PC to Mac, Mac to PC) must be done on a Mac harddisk - this is because the Mac has a more complex file system (it stores more information about & within files). Because of this, a Mac disk can keep a PC file without loss, but not the other way round, and that's why I can't write Maconverter for Wintel. But if you convert the files to PC on your Mac, they won't change any more when zipped and expanded on your customers PC. About Poser2, there isn't much to convert because it neither has preview thumbnails nor Geometries that could be distributed. For plain document files, Maconverter does the autotyping for Mac and "name adjusting" for PC. But I don't have any information about the success with it (because I never got access to the PC Poser2).