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Product Version = NetBeans IDE Dev (Build 201110050601) Operating System = Windows 7 version 6.1 running on x86 Java; VM; Vendor = 1.7.0 Runtime = Java HotSpot(TM) Client VM 21.0-b17 Adding an existing module to a suite doesn't update project view. You need to close the suite and open it again to actually see the change.
Created an empty suite /tmp/test203261a, then a standalone module /tmp/test203261b. Suite's "Modules" node was empty and module's "Important Files" node included "NetBeans Platform Config" and "Per-user NetBeans Platform Config" as expected. Right-clicked "Modules", selected "Add Existing", picked /tmp/test203261b. "test203261b" appeared beneath "Modules" as expected, as did "Suite Locator" beneath module's "Important Files". (platform.properties & platform-private.properties in the module should perhaps be deleted, but they are harmless.)