This rollout is accessible when Light cache is selected as the Engine for Secondary bounces in the GI rollout. See the Light Cache GI topic for more information on how this option works.
UI Path: ||Render Settings window|| > GI tab > Light cache rollout (when Light cache is selected as a GI engine)
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Dragging and dropping a .vrlmap file into the active viewport sets the secondary GI engine to Light Cache and the Mode to "From file".
