Centennial apps aren't really "sandboxed" in the sense that modern apps are - they use the same declarative installer format, but once the app is running it run

Centennial apps aren't really "sandboxed" in the sense that modern apps are - they use the same declarative installer format, but once the app is running it runs as the user with full trust and can party on the user's files and other apps etc. The filesystem and registry virtualization/redirection is for compatibility with the redirection the installer does and helps against accidental damage, but it's not a security feature.