: Software acquired outside of official distribution channels may compromise your digital product key or lead to genuine software validation failures.

a fresh copy of propsww2.cab from a reliable repository (like the SOLVUSOFT file database ).

: This is a Cabinet file, which is a compressed archive containing the actual application data, program files, and assets used by Office.

The installer will often detect the missing components and allow you to "Repair" the installation rather than reinstalling from scratch.