The Windows 1945 is the operating system of the Führerbunker.
Hitler reviewed it saying that it is extremely slow to the point of taking two weeks to install, 5 hours to start up and 4 bytes of RAM to render the cursor. Hitler even referred to it as shit compared to Windows 1942. Later, he got downloaded on Windows 1945 and made it crash while yelling Fegelein's name. In Hitler interviews President Obama, one headline in the Reich News Network said that Microsoft claimed that they did not make Windows 1945.