Some files say I need Adobe Acrobat Reader to use them. What is that?
Adobe® Acrobat® Reader® is free software that lets you view and print Adobe Portable Document Format (PDF identified by symbol) files. PDF is a universal file format that preserves all the fonts, formatting, graphics, and color of any source document, regardless of the application and platform used to create it. You can download Adobe Acrobat Reader from Adobe’s Web site. If you use the full version of Adobe® Acrobat®, you might find that documents appear with errors on the screen. You will need to download the update files from Adobe or download files and open them from your hard drive or network. Documents should print without a problem.