3. Text and Document Files Hypertext Markup Language File .htm Portable Document Format File .pdf Text File .txt Rich Text Format File .rtf Microsoft Word Document .doc
4. Executable and System Files Dynamic Link Library .dll DOS Batch File .bat Windows Executable File .exe DOS Command File .com
5. Data Files Comma Separated Values File .csv Zipped (compressed) File .zip Microsoft Excel Spreadsheet .xls PowerPoint Presentation .ppt PowerPoint Slide Show .pps
7. Video Files Macromedia Flash Movie .swf Real Media File .rm MPEG-4 Video File .mp4 Apple QuickTime Movie .mov Windows Media Video File .wmv Audio Video Interleave File .avi
8. Audio Files Windows Media Audio File .wma Real Audio Media .ram Real Audio File .ra WAVE Audio File .wav MP3 Audio File .mp3