Have you tried to disable UAC?
Edit: I have made a test: put UAC full upward, reboot and TYPViewer does not accept Drag&drop ( cursor "No Entry")
That's what I have seen on the web: UAC prevents drag&drop when the 2 apps do not have the same rights and in this case, explorer never has elevated privileges (as far as I know) and TYPViewer has elevated privilege ....
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