I write flags for successfully installed apps into the registry under HKLM, this would circumvent the .INI file locking issue. However, I do put my list of excluded computers into a .INi file, whcih at that point is read-only.

The advantage of HKLM is that when you re-image the computer, that key is removed and you re-inbstall the app. The .INI file would have to be updated manually in that case.
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