5 ms·

This is all MS Office file formats ending in “x”; xlsx, docx, pptx, etc

• RajT88 25d ago
  The old ones IIRC were MCDF files which you could dig into with a tool called OpenMCDF. MCDF was also the file format *.MSI files were based on for installing packages.
  • vaylian 25d ago
    By, "the old ones" you mean those file types without the "x"?
    • bena 25d ago
      Yes, Office 2003 and prior used proprietary file formats
      • DANmode 19d ago
        That were eventually reverse engineered by projects like LibreOffice.