How to exclude Steam games from Auto-Sandbox?

How could I make a rule for Auto-Sandbox in CIS 8.1 to exclude any apps run from within Steam.exe ?

Example without custom rule:
I run game shooter.exe from Steam client. CIS sandboxes it because it finds the file unrecognized.

What I want:
Run the game shooter.exe from Steam client without getting autosandboxed even though it’s unrecognized. But I still want it to get sandboxed if I run it direct and not through Steam client (Steam.exe).

Can this be done? Is what I’ve done correct (see attached images) or should i correct something?

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Change target to D:\Games\Valve\Steam\Steam.exe and remove Source, that should give you the desired effect. Also, position it above the other rules in the list.