Sorry to hear about the issues. I just tried your described method (D’n’D before opening H9 Control), and the same thing happened. If I launch H9 Control first, then drag ‘n’ drop over the open interface, I get “One Preset List and No Presets Imported”. The Preset List [L1000] is loaded up correctly. This is under Windows 8.1.
Let me know if this works for you. I could’ve sworn there was a complementary “Import” action to match the “Export Preset List” command, but apparently I haven’t had enough cafe cubano yet.