Computer File Name Extensions Which You Should Not Forget If You Are A Computer User

File extension awareness can prevent you from downloading potentially dangerous files. It will also let you know which application is needed to open them. Read this article and it will help you in your day to day work.
File extensions are like surnames (In a real life scenario). The name can be chosen by you during the time of saving the file. The extension is given to it by the application. The list below mentions some of the most frequently used file name extensions . In reality there are at least a thousand file extensions existing as of today.
SAMPLE : filename.extension
1. Text files - .txt 2. Documents / Word file - .doc 3. Microsoft Excel - .xls 4. Microsoft Access - .mdb5. Microsoft Power Point - .ppt
Compatibility pack which is available from Microsoft site can be used for opening/editing office 2007 files with older versions.
6. Images - .jpeg, .gif, .png7. Audio - .wav, .cda, .mp3 ( and other versions ), .wma etc8. Video - .mpeg, avi(audio video interleave), .dat(VCD video file), DivX (DivX encoded movie), .rm(real media)9. Installers/ Executable - .exe10. Corel Draw - .cdr11. True type fonts ( Windows ) - .ttf12. Webpage - .htm, .html, .xhtml13. Programmed webpage - .php, .aspx, .cfm14. Microsoft ebook reader - .lit15. Rich Text File - .rtf16. Photoshop - .psd17. Flash - .flv, .fla18. Compressed - .zip, .rar19. Icons ( Windows ) - .ico20. Outlook Express email - .dbx
Office 2007 has new file extensions. The 2007 Microsoft Office system introduces a new file format that is based on XML. It is called Open XML Formats.
Word
XML file type Extension Document .docx Macro-enabled document .docm Template .dotx Macro-enabled template .dotm
Word supports a DOCX format (macro-free document) and a DOCM format (document that allows macros). Administrators can control the use of these formats by Group Policy.
Excel
XML file type Extension Workbook .xlsx Macro-enabled workbook .xlsm Template .xltx Macro-enabled template .xltm Non-XML binary workbook .xlsb Macro-enabled add-in .xlam
PowerPoint
XML file type Extension Presentation .pptx Macro-enabled presentation .pptm Template .potx Macro-enabled template .potm Macro-enabled add-in .ppam Show .ppsx Macro-enabled show .ppsm Slide .sldx Macro-enabled slide .sldm Office theme .thmx