Some MP3 players require software, namely Microsoft Zune. You'd need the software to extract the files just go to zune.net, But if you've got a Sansa MP3 player or a Ipod then you can just go to My computer, Click on the MP3 player and copy the files from the mp3 player and place them anywhere on your computer. C:\Documents and settings\<current user>\My Documents\My Music.