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We read file headers, not extensions. Nothing gets uploaded.
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What is it
The old binary format for Microsoft Word (pre-2007). DOC files are still widely encountered but have been superseded by DOCX. If you receive a .doc file, most modern word processors can open it, but consider converting to DOCX for better compatibility.
Technical details
Safety
What opens it
Microsoft Word
Google Docs
LibreOffice Writer
Related formats