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ProPlusWW.msi and PropsWW2.cab are core installation files for Microsoft Office Professional Plus, and you likely need them to resolve a missing file error during an installation or repair process.

Activation Failures: If the file version doesn't match your Product Key's SKU, the installation may finish but refuse to activate.

  1. Copy the entire ProPlus.WW folder from the high-quality ISO to your local C:\Temp\Office\ProPlus.WW.
  2. Overwrite the existing ProPsWW2.cab with the new, verified version.
  3. Crucially: Delete the Office Setup Controller cache located at %ProgramData%\Microsoft\HelpLibrary and %temp%\*.log.

Note: The -r flag renames extracted files and verifies the digital signature.