If it registered then it's your problem that stop tool working....Net 4.5 is included with Windows 10.
Rebooted several times since installing Windows 10.
Turns out, 7-zip was registered to open it, though it's not a file association. Hmmm. Weird.
Need delete in register all associations with it
Install problem?: If you have installed vpk viewer or winrar auto open vpk when you double click on it, then you need delete association first: https://www.google.ru/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=delete file association windows 7
Installation: Download, unpack, run with admin and press install, reboot pc