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PDF files. Some of material on this site is in PDF files. You can download a free PDF reader from Adobe, the creator of this format. Adobe also provides access pages with lots of information including a free translation service intended to make PDFs accessible to screen readers.
ZIP files. Some of the files on this site are ZIPed files. Typically, these will be multiple files compressed into a single file for the purposes of distribution. PKWARE is a standard source for downloadable software to expand these ZIPed files. Alternatively, Info-ZIP provides very good shareware for dealing with ZIPed files.