File extensions

Ever wonder where these (mostly) 3 letter file extensions come from ? Here are 14 common ones :

• .bat : batch
• .bmp : bitmap
• .cfg : configuration
• .doc : document
• .exe : executable
• .flac : free lossless audio codec
• .gif : graphics interchange format
• .jpg : joint photographic experts group
• .nfo : information
• .png : portable network graphics
• .ppt : powerpoint
• .tmp : temporary
• .txt : text
• .wav : wave