What's the purpose of "Folder" rule for Auto-Sandbox?

[RejZoR]

Placed Steam.exe path into "File Location" field.

I wanted to exclude all the folders where Steam stores games and the folder looked like:
Steam/Steamapps/common/*

This in theory should mean any app under those folders shouldn't show me Auto-Sandbox popups.

The thing is, it doesn't work! But if I use "File group-> Executables" instead of Folder, then it works and it doesn't show me Auto-Sandbox popups anymore. I don't get it.