I have been working on an unattended install for Windows XP Home, and I found I have fumbled my clicks and sometimes have run files with the extensions ".reg" and ".cmd". I usually could avoid problems with the ".reg" file because of the confirmation, but the ".cmd" files just ran. In one case, I had a registry run within it and screwed up my machine so that I had to reinstall. I used "File Options" to change the default for the ".reg" files to "edit" instead of "merge". I also used "File Options" to change the default for the ".cmd" files to "edit" as well and then I decide to delete "open"