List of Common File Extensions

The computer file extension is commonly a three or four letter abbreviation that signifies the file type. For example, in letter.docx the filename is letter and the extension is docx. Here are some important computer file extensions:

Text Files
.log: Log File
.wpd: WordPerfect Document
.odt: OpenDocument Text Document
.pages: Pages Document
.doc: Microsoft Word Document
.docx: Microsoft Word Open XML Document
.tex: LaTeX Source Document
.wps: Microsoft Works Word Processor Document
.msg: Outlook Mail Message
.rtfRich: Text Format File
.txtPlain: Text File

Data Files
.vcf: vCard File
.dat: Data File
.pptx: PowerPoint Open XML Presentation
.sdf: Standard Data File
.tar: Consolidated Unix File Archive
.csv: Comma Seperated Values File
.xml: XML File
.pps: PowerPoint Slide Show
.ppt: PowerPoint Presentation

Audio Files
.aif: Audio Interchange File Format
.mpa: MPEG-2 Audio File
.ra: Real Audio File
.iff: Interchange File Format
.wav: WAVE Audio File
.wma: Windows Media Audio File
.mp3: MP3 Audio File

Video Files
.avi: Audio Video Interleave File
.3gp3: GPP Multimedia File
.flv: Flash Video File
.mpg: MPEG Video File
.vob: DVD Video Object File
.mp4: MPEG-4 Video File
.3g: 23GPP2 Multimedia File
.m4: viTunes Video File
.wmv: Windows Media Video File