Using Copy-Paste in the Windows Command Line isn’t straightforward by default. To paste anything, you have to right-click to open up the context dialog and click insert (or “Einfügen” in German J):
However, the Command Line does have some semi-hidden settings which can simplify things. You have to right-click the cmd.exe window title and enter Properties (“Eigenschaften” in my case):
In the Options tab, you should tick the Quick-Edit-Mode checkbox and press Ok. You can of course adjust the other options to your liking:
From now on, whenever you’ve got something in the copy buffer, a simple right-click pastes the content into the Command Line Window. Neato.