MP3 Format

MP3 files are compressed to reduce their size, making them faster to download. This "lossy" compression permanently removes audio information, while attempting to preserve sound quality. Varying levels of MP3 compression can be used; a high level of compression will result in smaller files, but greater loss of sound quality.

Your operating system will most likely already include software that will allow you to play files in MP3 and other common audio formats. Below are alternative programs that you may wish to try:

	VLC (VideoLAN Client) is a free cross-platform media player and streaming server.
	Audacity is a free multitrack sound editor.

Portable Document Format

Portable Document Format (PDF) preserves the layout of a document, complete with fonts and graphics, so that it can be displayed and printed on different operating systems.

To view and print Portable Document Format (PDF) files, you need the Adobe® Reader® software. You can download this free software from Adobe Systems. This icon indicates that an item on this site is available in PDF format.

Real Format

To play audio or video in Real format, you need the free Real Player, which is available from Real Networks. Look for a link to the "free Real player."

ZIP Format

ZIP files are compressed to reduce their size, making them faster to download. You need to decompress ("unzip") ZIP files in order to be able to work with them. To decompress ZIP files, you can use the following software:

StuffIt Expander, which you can download free of charge from Aladdin Systems.

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