usOperation (USHORT)

Flags.

DF_MOVE

The operation was a move. If this flag is not set, the operation was a copy.
DF_SOURCE
The receiving window was the source of the drag. If this flag is not set, the receiver was the target of the drop.
DF_SUCCESSFUL
The drag operation was successful for the file. If this flag is not set, the operation failed.

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