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Oct 8 2008, 11:08 PM EDT (current) TomySky 80 words added
Oct 8 2008, 11:06 PM EDT TomySky

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Codec (short for Compressor/Decompressor) is the "wrapper" in which a file is contained. The computer must have the proper codec reader to be able to open the file. The computer does not know a file is an image unless it knows that the file is a .jpg, .psd, .png, etc. Then, if it has the proper codec for that file type, it can open the image.

This is true of all file types, be they a .docx or a .ac3.