Almost all of the files available for download from this site, are compressed ZIP archives. This is the case when the file you download ends in .zip. To unzip the archive you can use a program called Winzip which you can get from www.winzip.com.After you install Winzip you can double-click the ZIP archive file you downloaded and open it. Winzip will open a window in which you will find all the files contained within the archive.
The files in the zip archive can be of different types. The most common ones used here are listed below, together with the recommended program to view them.
.PDF: Adobe Acrobat Reader. (Get it Here)
.DOC: Microsoft Word for Windows.
.PPT: Microsoft PowerPoint for Windows.
.PS: Ghostscript/Ghostview. (Get it Here)
.JPG: IrfanView. (Get it Here)