Explanation

Document is in the Adobe Portable Document Format (.pdf). You will need Adobe's Reader software to view and print the .pdf files. Adobe Reader can be downloaded for free from the Adobe web site by clicking on the Get Adobe Reader button on the right.

Document is in the form of a rich text format (.rtf) file created from Microsoft Word. This file can be opened and edited in Microsoft Word and most other major word processing programs.

Document is in the form of a Microsoft Word (.doc) file created from Microsoft Word. This file can be opened and edited in Microsoft Word. Other word processing programs may also be able to import this format.

Document is in the form of a WordPerfect (.wpd) file created from Corel WordPerfect. This file can be opened and edited in WordPerfect. Other word processing programs may also be able to import this format.

Media file is in the form of a Apple Quicktime Movie file. This file can be opened using the free Apple Quicktime Player, which can be downloaded from the Apple web site.

Media file is in the form of a MPEG-1 Movie file. This file can be opened using Windows Media Player, Apple Quicktime Player, and most DVD Player Programs, such as PowerDVD, and WinDVD.

Media file is in the form of a Real Player Video file. The file can be opened and viewed using RealPlayer 10 or higher.

Media file is in the form of a DivX Video file. The file can be opened and viewed using the free DivX Player (Windows, Mac) and newer versions of most DVD Player Programs, such as PowerDVD, and WinDVD. It may also be viewable in other media players after downloading and installing a free codec (DivX for Windows, or DivX for Mac).

Media file is in the form of a Windows Media Video file. The file can be opened and viewed using the Windows Media Player (available for both Windows and Mac). It can also be played using Apple Quicktime Player by downloading Windows Media Components for QuickTime, by Flip4Mac.

Media file is in the form of a MP3 Music file. This file can be opened using Windows Media Player, Apple Quicktime Player, and many third party programs, such as Musicmatch Jukebox software

File is in the form of a .zip file or self-extracting .exe file. 

A .zip file is a compressed version of the actual file. To use the file, you must use a program on your computer (such as such as WinZip, PKZIP, Stuffit) to extract the file after downloading.

A self-extracting .exe file (useful only for a Windows Computer) is a compressed version of the file with a "built-in" extractor. Double-clicking on the .exe file in Windows will extract the file to a default folder.