![]() Microsoft Word has used the DOC file format for over 30 years. As an extension explicitly for Microsoft’s proprietary document processor, the format was also proprietary: Word was the only program that officially supported DOC files until Microsoft opened the specification in 2006, after which it was reverse-engineered. Microsoft Word started using the DOC format and file extension over 30 years ago in the very first release of Word for MS-DOS. DOC is only necessary if the file will be used by pre-2007 versions of Word. Both are relatively open, but DOCX is more efficient and creates smaller, less corruptable files . What’s the difference, and which one should you use?ĭOC is a document format used by Microsoft Word, while DOCX is its successor. This wasn’t simply a belated 1990s “extreme” version of the format-that extra X stands for the Office Open XML standard. Starting in 2007 with the updated version of Word (and Microsoft Office), the default save format was changed to DOCX. ![]() For most of its long history, Microsoft Word has used a proprietary format for its saved files, DOC.
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