HP 39g hp 39g+ (39g & 40g)_mastering the hp 39g+_English_E_F2224-90010.pdf - Page 201

Generally you will be able to click on a link for each aplet and see a summary on screen, together with a link that lets you download that aplet as a ZIP file. A ZIP file is a special type of file which contains one or more compressed files. The reason for the compression is simply to allow you to download them from the Internet more quickly, and you should de-compress them as soon as you have them onto your PC or Mac. There are many programs which will de-compress ZIP files. The most commonly used Windows program is Winzip®, which can be found at http://www.winzip.com. The Winzip® program can also usually be found on the disks which accompany many computer magazines. Calculator Tip It is absolutely critical that you decompress each aplet into a separate directory. Each aplet has two files (HP39DIR.000 & HP39DIR.CUR) which always have the same name. Decompressing two zip files containing aplets into the same directory overwrites the first one's files with the second. The aplet itself will not be harmed by this but the effect is to render it invisible to the calculator, since the two special files contain information which is sent to the calculator in order to tell it what the directory contains. Organizing your collection Shown below and right is the contents of one directory in part of my collection. If you're only going to download a few aplets then organization will not be as important. If you are a teacher or if you are intending to download lots of aplets then you might consider setting up a logical structure of directories to contain them. 201