The tool removes pillarboxing and adjusts the vertical FOV to match that of 16:9.

It's meant for 21:9 but it can also be used to increase FOV at 16:9.

Use software like PeaZip or 7-Zip and password pcgw to unpack the archive.

Tested with the latest Xbox Game Pass version at 2560x1080.

You can buy me a coffee here.