These books require no special software to open them and can be read on any computer with a Microsoft Windows operating system (any of them, it doesn't matter). Some are available for purchase and others can be downloaded free. The format is often used for Help files that come with computer programs. It would be very nice if you would look for at least one title to purchase from time to time - whether electronic or printed, if you are downloading the free files, as a mark of your appreciation for the site and the freebies... We will add more freebies as often as we can. | 
