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2021-06-17 2022-10-21 (current)
it's been almost 3 years since the bug in windows 10 was fixed (martin) link update (martin)
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When the extension is not installed, WinSCP uses a trick to allow drag&drop downloads. It tells Windows File Explorer that the files are in temporary folder (from where Windows File Explorer knows how to get the files) and a moment before the Windows File Explorer starts to copy files from there, WinSCP downloads the files there. When the extension is not installed, WinSCP uses a trick to allow drag&drop downloads. It tells Windows File Explorer that the files are in temporary folder (from where Windows File Explorer knows how to get the files) and a moment before the Windows File Explorer starts to copy files from there, WinSCP downloads the files there.
-To allow direct drag&drop downloads, the shell extension was developed. It misuses Windows File Explorer CopyHook's. [[https://docs.microsoft.com/en-us/previous-versions/windows/desktop/legacy/bb776048(v=vs.85)|CopyHook]] is a COM object (DLL library) that is called by Windows File Explorer whenever directory (not file) is transferred within file system. When you drag anything from WinSCP, it creates empty dummy folder in temporary directory and pretends that you as user drag that directory. Once your drop it to Windows File Explorer, it calls the CopyHook's (including the WinSCP shell extension), telling it what and where was dragged. This way WinSCP knows the actual destination. It cancels the drag&drop operation, so the dummy directory is not copied by Windows File Explorer and transfers your actual selection to now-known destination.+To allow direct drag&drop downloads, the shell extension was developed. It misuses Windows File Explorer CopyHook's. [[https://learn.microsoft.com/en-us/previous-versions/windows/desktop/legacy/bb776048(v=vs.85)|CopyHook]] is a COM object (DLL library) that is called by Windows File Explorer whenever directory (not file) is transferred within file system. When you drag anything from WinSCP, it creates empty dummy folder in temporary directory and pretends that you as user drag that directory. Once your drop it to Windows File Explorer, it calls the CopyHook's (including the WinSCP shell extension), telling it what and where was dragged. This way WinSCP knows the actual destination. It cancels the drag&drop operation, so the dummy directory is not copied by Windows File Explorer and transfers your actual selection to now-known destination.
This on the other hand explains why with the extension you cannot drag files to any other application except for the Windows File Explorer. No other application would call the CopyHook. This on the other hand explains why with the extension you cannot drag files to any other application except for the Windows File Explorer. No other application would call the CopyHook.

Last modified: by martin