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You have an .odp file — an OpenDocument Presentation. It's the open-standard equivalent of PPTX, used by LibreOffice Impress, Google Slides (for export), and OpenOffice. The format is an ISO standard, which means it's not controlled by any single company.
ODP uses the same ZIP-of-XML structure as other OpenDocument formats. Slides, animations, transitions, and speaker notes are all supported. The format's main advantage is that it's truly open — any application can implement it without licensing fees. The disadvantage is that ODP files opened in PowerPoint sometimes lose formatting, and PPTX files opened in LibreOffice Impress sometimes do the same. The conversion is good, not perfect.
LibreOffice Impress (free) is the primary ODP editor. Google Slides can import and export ODP. Microsoft PowerPoint can open ODP files, though complex formatting may shift. If you need to collaborate with PowerPoint users, save as PPTX. If you're committed to open standards or your organisation mandates ODF, ODP is the presentation format you want.