OK, so once the Developer Tab is added to the Word or Excel Ribbon ... Once done, you need to create a REG_DWORD value. For that, right-click on options > New > DWORD (32-bit) Value and name ...

In a nutshell: Netherlands-based software engineer Wojciech Graj has created another unusual port of the iconic first-person shooter Doom, ingeniously embedding it within a Microsoft Word document.