Exception occurred when drag remote file to local

I use WinScp v4.1.6. When I drag remote file to local, exception occurred. Borland C++ builder shows "Project WinScp raised exception with message 'shell drag extention support is enabled, but the extention is not loaded. Ether it is not installed or you have not restarted the computer yet after installation. Install the extention or switch to compatible dragdrop mode (from preference window), which use temporary folder for downloads.

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