Tuesday 23 August 2011

Windows Installer reference counting implementation on the registry

The old reference counting strategy was using the SharedDlls key:


This is legacy, for many good reasons.
But where is the new reference counting strategy implemented?
The "new", in quote because it has been around for a while nowadays, Windows Installer way is implemented under a different registry key:


where the key S-1-5-18 is for per applications installed machine-wide, while the eventual other SIDs are for the user applications.

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