Add it to the end of the target in the shortcut or you can do it from the command prompt. Put a space between "exe" and "-dx11" or Windows is going to tell you the filename is wrong.

On top of what DoomSooth said, keep in mind that if there's a space in the path it'll be between quotes, in which case the arguments must be outside of it.
ex (assuming it's Thymesia.exe):
D:\Games\Thymesia\Thymesia.exe -DX11
but
"D:\My Games\Thymesia\Thymesia.exe" -DX11

Hmmm... No quotes in mine. Must be a Windows 10 or 11 thing.

IN MY OPINION it doesn't run
but i'm not professional

Can you elaborate on that? ;)

Bots are not the elaborating type... ;)

Yeah, I know, but lately I accused two users of being bots, and then it turned out that they weren't native speakers and just phrased their posts unusually.
Now I reassure that they are actually bots. Just hadn't the time for a full Voight-Kampff- test this time.

Mafia Definitive Edition works fine (so far) with the latest dxvk release.

I was only able to find the Linux version of dxvk. Is there a special version for Win 7 or is there only one version for both OS?

Is there a manual how to install and configure it on a Win 7 machine? I'd like to link it here for the people who are clueless like me :)

Don't know. But it's relatively simple:
-download the latest release
-Mafia DE uses 64bit dx11, so you have to extract dxgi.dll and d3d11.dll from x64 into the game folder where the game exe resides
-optionally you can configure dxvk via a dxvk.conf, which is placed beside the dlls.

Thanks, I´ll link your post.

'In sound mind' works on Windows 7.

2077 still runs in Windows 7, after updating to 1.6.