There are two facts:

• In Microsoft's Virtual-Key Codes documentation, this key does not exist
• In Microsoft's DirectInput Keyboard Device Enumeration, there is a DIK_NUMPADENTER

I used to think window messages couldn't differentiate between Enter and Numpad Enter, but:

• Press Enter key
  
• Press Enter key on numpad
  

This issue is also mentioned in the source code of Dear-ImGui (imgui_impl_win32).

Since my application was migrated from DirectInput to DirectXTK Keyboard, will the Numpad Enter key be officially supported in the future?