The DOC file format is a format that is written by Microsoft Corporation for their Word software.  Microsoft Office Word is a enables the sharing and creation of documents using a set of writing options. In the years after the first Word, other versions of Word may slightly differ from the initial content. For instance, The oldest Word will have problems opening a word file from Word 2007. Besides Microsoft Office Word, other software have been designed to open or save DOC files such as OpenOffice, TextMaker Viewer, Zoho Viewer or Free Microsoft Viewer. Mime type: application/msword [official]. application/doc, appl/text, application/vnd.msword, application/vnd.ms-word, application/winword, application/word, application x-msw6, application/x-msword