This message is posted to the source window involved in the drag operation when the drag set is dropped on a valid target window.

The source window must examine hwndTarget to determine if the target window is the same as the source window. If it is not, the source window must immediately free the DRAGINFO; if the source and target windows are the same, the DRAGINFO must be freed by the target window after completing the post-drop conversation.

Note: Lazy drag enabled applications are expected to process this message; standard drag applications are not.

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