Open Print Spooler
OpenPrintSpooler is a sandbox setting that provides nuanced control over how sandboxed applications interact with the print spooler service.
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[DefaultBox]
OpenPrintSpooler=n
This setting prevents sandboxed applications from setting up printers outside the sandbox.
The filter can be disabled by setting OpenPrintSpooler=y
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Added as part of 0.5.4 / 5.46.0 version.
See also ClosePrintSpooler.