File Extensions you should know:
.doc, .docx
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MS Word Document
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.abw
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Abiword document
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.xls, .xlsx
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Excel Document
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.ppt, .pptx
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PowerPoint document
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.exe
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Executable document (program)
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.jpg, .gif,.bmp
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image
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.mp3, .mp4 .wav, .wma
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audio
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.wmv, .mov, .mp4, .mpg
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video
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.html
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hypertext markup language (web page)
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.txt
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text document (Notepad)
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.pdf
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portable document file format (Adobe Acrobat)
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Links to sites listing file extensions (there are LOTS if them):
http://en.wikipedia.org/wiki/List_of_file_formats_(alphabetical)
http://filext.com/
http://www.file-extension.com/
http://www.sharpened.net/helpcenter/extensions.php
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