Many of the files which are available to download from this site have been Zipped. Zipping is the process of packing a set of files into a single file or archive, called a Zip file. It is more convenient to be able to download a single Zip file than to download the multiple files contained within it. Zip files are also usually compressed and therefore take up less space to store and take less time to download. All of our Zip files have been compressed.

In order to extract files from Zip archives you will need to obtain software capable of unzipping them. Such software is available for a variety of computer platforms and operating systems, often as "freeware" or "shareware".

In order to find unzipping software appropriate to your computer system we recommend you try searching on a popular Internet search engine. You might try searching for "zip software" or "file compression" and then pursue those entries which relate to file zipping and unzipping.