Using your ExplorerDemo, The Paste button uses this code:
IEFolderMView.PasteFilesFromClipboard();
If I use Ctrl+C in File Explorer, then click the Paste button in the demo program, it MOVES the selected files rather than copying them.
I tried stepping through your code but it wouldn't let me. I tried putting ShowMessage at various points to see what code executed and that didn't work either. I guess I don't know how to step through your code. I hope I don't run into this same problem when I try to diagnose the problems with Devices. I'm hoping to do that soon, but there are a bunch of things with higher priority.