OpenClsid is a sandbox setting in Sandboxie Ini. It specifies the COM class identifiers for unsandboxed COM objects that should be accessible by a sandboxed program.
Examples:
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[DefaultBox]
OpenClsid={D713F357-7920-4B91-9EB6-49054709EC7A}
This example makes the HP Universal Printer Status Monitor pop-up component accessible to sandboxed programs.
Related Sandboxie Control setting: Sandbox Settings > Resource Access > COM Access
Related Sandboxie Plus settings:
Sandbox Options > Resource Access > COM > Add COM Object > Access column > Open
Sandbox Options > Resource Access > COM > Don't use virtualized COM, Open access to hosts COM infrastructure (not recommended)