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Topic on Talk:The big list of third-party DRM on Steam

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7-Zip doesn't extract installation scripts for some formats (which can contain registry changes etc. applied by the installer) so that's probably where those changes are located.

Special extractors exist for certain installer formats but I don't have the DLC installer downloaded at the moment to check what format it uses and whether its changes can be discovered that way; failing that any registry changes can be captured using regshot.