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You received a .ppt file — the legacy PowerPoint format from the pre-2007 era. Like .doc and .xls, it's a proprietary binary format that Microsoft applications handle perfectly and everything else handles with varying degrees of success. If you're getting .ppt files in the current decade, they're archived presentations or from very old systems.
The .ppt format stored slides, animations, transitions, and embedded media in a binary OLE2 container. Complex animations and custom fonts from the PowerPoint 2003 era may not render correctly in modern applications. The format was also a common vector for macro viruses in its heyday, though modern antivirus tools catch these reliably.
Microsoft PowerPoint opens .ppt perfectly and can convert to .pptx (File → Save As). Google Slides imports .ppt files with reasonable fidelity. LibreOffice Impress handles basic .ppt files well. If you have a library of old .ppt presentations, consider batch-converting to .pptx — it's the modern standard with better compatibility and smaller files.