DOC is a word processing file created by Microsoft. This files format turns a plain-text format into a formatted document. It supports almost all the Operating Systems. It can contain large amount of text, data, charts, table, image etc. It can contain rich text format (RTF) and HTML texts also.
DOCX is an XML based word processing file developed by Microsoft. DOCX files are different than DOC files as DOCX files store data in separate compressed files and folders. Earlier versions of Microsoft Office (earlier than Office 2007) do not support DOCX files because DOCX is XML based where the earlier versions save DOC file as a single binary file.
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