.doc: word processing documents such as Microsoft Word or Pages for mac
.xls: spreadsheet documents such as Microsoft Excel or Numbers for mac
.ppt: slide presentation document such as powerpoint for Microsoft Powerpoint or Keynote for mac
.wmv: Windows Media Video (WMV) is a video compression format for several proprietary codecs developed by Microsoft (Source: Wikipedia.org)
.aup: format for the pieces of the music editing in the audacity program. Not the compressed song
.mp3: It is a common audio format for consumer audio storage, as well as a digital audio compression for the transfer and playback of music on digital audio players. (Source: Wikipedia.org)
.mp4: It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. (Source: Wikipedia)
.jpg: the most common image format used by digital cameras and other photographic image capture devices; along with JPEG/JFIF, it is the most common format for storing and transmitting photographic images on the World Wide Web. The term "JPEG" is an acronym for the Joint Photographic Experts Group which created the standard. (Source: Wikipedia.org)
.tiff: TIFF (originally standing for Tagged Image File Format) is a file format for storing images, popular among graphic artists, the publishing industry,[1] and both amateur and professional photographers in general. As of 2009, it is under the control of Adobe Systems. Originally created by the company Aldus[2] for use with what was then called "desktop publishing", the TIFF format is widely supported by image-manipulation applications, by publishing and page layout applications, by scanning, faxing, word processing, optical character recognition and other applications. (Source: Wikipedia.org)
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