Windows 10 Activation File ((link)) -

A Windows 10 activation file, also known as a product key or license file, is a small text file that contains a unique code used to activate a copy of Windows 10 on a computer. The activation file is used to verify that the copy of Windows 10 is genuine and has been purchased from an authorized retailer.

Are you currently seeing an (like 0xc004f050), or are you trying to transfer a license to a new computer? windows 10 activation file