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You have an .ods file — an OpenDocument Spreadsheet. It's the open-standard alternative to XLSX, used by LibreOffice Calc, Google Sheets (for export), and OpenOffice. If someone sent you one, they're probably using LibreOffice or intentionally avoiding Microsoft's format.
ODS supports formulas, charts, multiple sheets, conditional formatting, and pivot tables. It's an ISO standard (ISO/IEC 26300), which means the specification is publicly available and not controlled by Microsoft. Most basic spreadsheet operations translate perfectly between ODS and XLSX. Complex macros and some advanced conditional formatting may not survive the round trip.
LibreOffice Calc (free) is the primary ODS editor. Google Sheets imports and exports ODS. Microsoft Excel can open ODS files — File → Open handles it directly. For sharing with Excel users, save a copy as XLSX. Most spreadsheet operations work identically in both formats — the differences only surface with advanced features.