misc FILEZILLA Could not determine the target

"Could not determine the target of the Drag&Drop operation." hmm ?

<a href="https://wiki.filezilla-project.org/Using#Re-registering_the_shell_extension_.28Windows_only.29">Filezilla wiki</a>

Re-registering the shell extension (Windows only)

Especially on Vista or Windows 7 it can happen that Drag&Drop fails and you get an error message stating the shell extension doesn't work. In this case you may need to re-register it. Here's how:

1. Open a command prompt as administrator. This is important!
Start Menu - All Programs - Accessories: Right Click 'Command Prompt', select 'Run as administrator'

2. Navigate to the Filezilla program directory.
Example (32bit): cd "\Program Files\Filezilla FTP Client"
Example (64bit): cd "\Program Files (x86)\FileZilla FTP Client"
3. Re-register the shell extension.
Type 'regsvr32 fzshellext.dll' (without quotes of course)

4. If you have 64bit OS, you need to perform an additional step.
Type 'regsvr32 fzshellext_64.dll' (no quotes as well)

If you get the reply 'DllRegisterServer in ... succeeded.', you've done it (though you probably still need to reboot your computer).

You NEED to reboot the computer.