I am having problems running Fallout 3 GOTY on a PC with Windows 10, NVidia GeForce RTX 2060, Intel i9-9900K CPU, 32 GB RAM

I played Fallout 3 years ago successfully on a Windows 7 gaming PC I had.
Recently I decided to try it on my current PC (described above).

Fallout 3 GOTY install fine but when it tries to launch it shows a black rectangle for the window for a short period of time then closes.

After searching online and watching a bunch of YouTube videos on how to setup Fallout 3 I tried the many suggestions.
Such as...
bUseThreadedAI=1
iNumHWThreads=2

in the INI file.

I set the fallout3 executable properties to windowed mode, run as administrator and tried various compatibility modes.
Nothing helps.

I don't think I have anything unusual regarding my system so it is hard to believe the game has this much trouble running.

Has anyone else had this problem?

Try dxvk (https://github.com/doitsujin/dxvk/releases). I haven't tried it with Fallout 3, but it resolved issues I was having with both New Vegas and Oblivion.

I made some progress where I can at least run the base Fallout 3 game from the fallout executable and the launcher executable.

I tried this fix from the Nexus Mod website - Intel HD graphics Bypass package Mods ID: 17209
It is a dll file (d3d9.dll) that gets dropped into the Fallout 3 game directory.
As I understand it the dll was designed to fix problems with games running an Intel video graphics card.
Someone mentioned that is works by fooling Fallout 3 into thinking it is running a NVIDIA GeForce 7900 GS.
My Fallout 3 preferences INI has this entry - sD3DDevice="NVIDIA GeForce 7900 GS"
My video card is an NVIDIA GeForce RTX 2060 SUPER.

Perhaps I only needed to figure out a different sD3DDevice value for my card ?

Along with the dll the patch comes with a fallout.ini file to use instead of the original.

So now I can at least play the game if I want.

Ideally I wanted to use Mod Manager 2 to manage running the game but right now, launching through Mod Manager still doesn't work. I need to figure out that problem next.

I messed around with the Mod Manager 2 INI editors (for the INI files it runs the game with).
I finally got Fallout 3 to run again with Mod Manager 2 (v2.5.0) and with two mods so far -
Updated Unofficial Fallout 3 Patch (OGG)(v3.3.6)
and
Command Extender (v 22.0)

I run the game in windowed mode.

Next I tried the One Tweak for Fallout 3-21337.
It works but I'm not sure I will keep it. For now I turned it off in Mod Manager 2.

The game runs slow and choppy so I need to figure out how to improve that.
I'm running with an Intel i9 3.60 GHz processor.
There are supposed to be some mods or tweaks to improve performance of Fallout 3 on a modern PC.