Data Files: dat – A data file, .key – A Keynote Presentation, .ppt – A Microsoft PowerPoint Presentation, .xml – A XML file, .csv – A Common Separate Values file/ Audio Files: aif – An Audio Interchange File Format, mp3 – An MP3 audio file, .wav – A Wave audio file, .wma – A Windows Media Audio file. Video Files: .flv – A Flash Video file, .avi – An Audio Video Interleave file, .wmv – A Windows Video file.