The files are all saved as high resolution and quality, print-ready Adobe Acrobat v6 PDF files. You may have problems viewing them using older versions of the reader software; if this is the case, the free reader software is available here. If you right click on the download link and select 'Save Target As' you can then download the file to your hard disk. Alternatively, if you just click on the link, each file will open up in a new window - should you need to save it, click on the 'save file' icon that appears in the menu bar in your browser (it should look like a floppy disk), or choose file>save from the menu.