.doc is a file extension for documents created using Microsoft Word Processor called “WORD or MS Word”. Microsoft word is word processor with desktop publishing capabilities. The .doc files can contain formatted text, images, tables, graphs, charts, page formatting, and print settings. It was the default file extension used by Microsoft Word Versions prior to word 2007. From word 2007 the extension was changed to docx. You can open .doc files with the current versions of Microsoft Office.