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A property of the SYSTEM built-in variable that sets the override procedure for the FILEDIALOG internal Clarion procedure. Equivalent to {PROP:LibHook,2}. Assign the ADDRESS of the overriding procedure, and the runtime library will call the overriding procedure instead of the FILEDIALOG procedure. Assign zero and the runtime library will once again call its internal procedure. The overriding procedure's prototype must be exactly the same as the FILEDIALOG procedure found in the BUILTINS.CLW. (WRITE-ONLY)