The Universal Product Code is a barcode symbology that is widely used worldwide for tracking trade items in stores.
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Files with .DOC extension represent documents generated by Microsoft Word or other word processing documents in binary file format. The extension was initially used for plain text documentation on several different operating systems. It can contain several different type of data such as images, formatted as well as plain text, graphs, charts, embedded objects, links, pages, page formatting, print settings and a lot others.
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You can also sign other file formats. Please see the list below.