Yep, that's what I did, after reading this Win10 related thread.
Maybe I have a misunderstanding of the 'helper' tool DGVoodoo2:
I unzipped the EXE and its support files into the FU folder; it creates a subfolder MS with these two mentioned DLLs. FU will not see those of course. But if I copy them to the main FU folder, the program immediately barfs 'DirectX 6.0 or higher must be installed', does not even start the main screen. Removing these imported files starts FU, but not any flights, as explained earlier: error code C0000005 right after showing the map.
I have not tinkered with the DGVoodoo settings, not sure how they can possibly 'stick' when changing them? Does this tool have to run in parallel all the time to emulate a Voodoo graphics card? For me it makes no difference.
DXdiag shows that my laptop runs at DirectX 11 level. Other games dropped various versions of DirectX (7,8..) to my system during their installation, but apparently only the highest 'sticks'. Assuming backward compatibility I should be fine this way.
Other ancient/older simulator programs do run OK, e.g. many old racing games, even FlightSim 2004.
I really wanted to revive memories of sailing around the S.F. area, where I used to live as a German when FU3 was originally published. Looks like the sky is fogged up for me, sadly..
I am tempted to do a test installation of FU3 on my 'official' Win10x64 laptop, but do not really want to mess with my workhorse.
Any more ideas? Thanks for all hints!