That was easy!
I followed these instructions I found on the forum. Sorry, I don't remember who posted it but, THANK YOU whoever you are
It was the "no com port" problem for me. No problem with the dll.
The only thing I would add to the instructions is...
After you run the text file you made, you can delete it.
FMS 2.0 Alpha 8.5 is running great now!
Just need to download some slow flier planes:)
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If the VISTA PC has no COM port, FMS will not start.
To solve the problem a "vitual" communications port (COM port) must be installed
1. Click on the Windows [START] button, then double-click "Control panel".
2. Double-click on [Hardware]. The wizzard is launched. Click on [Next]. The search process starts and will take some time.
3. Mark "Yes, I have already connected the hardware."
Then click [Next].
4. Scroll fully down and select "Add a new hardware device."
Then click [Next].
5. Mark "Install the hardware that I manually select from a list."
Then click [Next].
6. Select "Ports (COM & LPT).
Then click [Next].
7. In the left-hand window select "Standard port type", in the right-hand window selectt "Communications port".
Then click [Next].
8. Then click [Next] again and then [Finish].
9. In the Control panel double-click [System], select the register Hardware and click [Device manager].
10. Scroll down to "Ports (COM & LPT)" and expand by double-clicking on "Ports (COM & LPT)".
11. Now you should see the installed communications port marked with a yellow sign containing an exclamation mark
(eg. Communications port (COM4)).
12. Open the Note pad program and enter the text below between, but not including, the dashed lines:
----------------------------------------------------------------
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM]
"\\Device\\Serial0"="COM1"
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Replace the figure "1" behind COM by the one, you found in step 11.
13. Store the file as "FMS-COM-Port-Fix.reg" on the desktop.
14. Double-click the icon on the desktop and confirm the appearing questions by clicking [OK].
15. Copy the file "d3dm.dll" into the FMS program directory.
Now the virtual communication port should be installed and FMS will start.