Strangechild, Mac files typically have a data fork and a resource fork. We don't notice that there are two types of information streams unless we are moving files between the different operating systems. Since this program was originally written for the Mac, it is possible that the .rsr information is the stuff we have tucked neatly away in the resource fork... just set out plain and obvious for PC users. The code has changed a lot since then, but I suspect that is where it started. Hmm... that is an interesting question... now I'm curious. Of course, anybody who worked in tech support would know what files are necessary and what they actually do before giving other people advice on what should be installed where. Carolly