Any further thoughts on this would be appreciated. So far, the files at the Nevada Public Utilities Commission, which are ApplicationXtender files, are the only files put out by a public entity for public consumption that I have not been able to read on my Vector 5.8 system.
If there is another linux program that would open them, I would try that. I am not too sure I am up to installing pure Slackware, as suggested by bigpaws. I guess I could try wine or some such and see if that works (I don't now use wine). If Windows should be necessary to open ApplicationXtender files, I may write some letters to some folks and investigate whether that practice complies with laws requiring public files to be public. It would be embarrassing to do that only to find out that there is a linux program that reads the files. Perhaps I should post my questions on a Slackware forum?