A .pdf file can only be read by Adobe Acrobat Reader. Many of the necessary programs are free to download on the web. Many software companies provide readers free to download off the Net. Microsoft provides readers for Word, Excel and Access. These readers do not allow you to modify the file, just read and print it.
Some files are in compressed format, most common being .zip.
For instructions on unzipping these files, Click Here . Click the link for detailed instructions on using Copy and Paste . Everyone has heard of Napster. Actually it has been possible to download and listen to music available on the web for some time. It helps to know something about the different formats used in music files.