Direct3d - Changing resolution ratio

Hello,

I'm working on a pc game c++ source which is not written by me and I'm trying to display the game in different resolutions except 4:3. The code is implementing the direct3d libraries.

The game is loading the resolution from a txt file, so once I change the resolution in the file the game does open with the requested resolution but the game keep on rendering on a 4:3 ratio with black borders.

Since I don't have experience with the direc3d libraries I'm here to ask for help.

Maybe you can direct me to the right functions or give me any kind of information that will help.

Thank you.
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