This is what I've had to do to get it to work, after reading a number of comments and reloading the software time and time again.

(1) I load 3DX 7 - Dx11.reg, then launch it from the bin folder and I get a message Load MSX error, but it loads and works?
I close it down, try and launch it from my taskbar it loads a program with the splash then completely disappears.

(2) I load 3DX 7 – Dx9.reg, then launch it from the bin folder and I get a message Load MSX error, but it loads and works?

(3) I close it down the computer, try and launch it from my taskbar and it works, then I do the following to see what DirectX I am using?

(4) Hold down the “Windows Key” and press “R” to bring up the Run dialog box.
Type “dxdiag“, then select”OK“.

Current Date/Time: 18 September 2019, 06:36:26
Computer Name: DESKTOP-OLENDKU
Operating System: Windows 10 Home 64-bit (10.0, Build 18362)
Language: English (Regional Setting: English)
System Manufacturer: PC Specialist LTD
System Model: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz (12 CPUs), ~3.7GHz
BIOS: P7xxTMl
Processor: 5.12
Memory: 32768MB RAM
Page file: 12317MB used, 25255MB available

DirectX Version: DirectX 12 ???????

I’m a bit confused now, obviously I don’t want to use a low-level, virtualized interface into graphics hardware?

What a rigmarole, and I don’t know whether I’ve done any harm?

Many thanks
Brian