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You have an .odt file — an OpenDocument Text file. It's the open-standard equivalent of DOCX, used by LibreOffice Writer, Google Docs (for export), and OpenOffice. The format is an ISO standard, free from any single company's control, and a perfectly capable word processing format.
ODT files are ZIP archives containing XML content, styles, and embedded media — the same architecture as DOCX, just with a different XML schema. The format supports everything you'd expect: headings, paragraphs, tables, images, footnotes, track changes, and styles. Cross-format compatibility with DOCX is good but not perfect — complex formatting, embedded fonts, and advanced table layouts sometimes shift when opened in a different application.
LibreOffice Writer (free) is the primary ODT editor and handles the format natively. Google Docs imports and exports ODT. Microsoft Word can open ODT files (File → Open) with reasonable fidelity. For maximum compatibility with Word users, save as DOCX. For document archival and government submissions (some jurisdictions mandate open formats), ODT is the appropriate choice.