i recently had to upgrade to windows 10 and have gotten Fighting Steel to work on it at last and looking fairly decent with only a minor negligible graphics glitch
that D3DRM.DLL file is all over the place, i found many downloads and links and such for it , the one that i ised which is fine is here
https://www.dll-files.com/d3drm.dll.html - just scroll down to the available mirrors and select the first one to download
you need to also install the NWSonline Fighting Steel Project mod of course too.
also what you need is dgvoodoo2_53.zip - this voodoo wrapper thingy is good at emulating older gfx it seems and after adding its files - the dlls from its ms folder and the dgvoodoo exe to my fighting steel folder and fighting steel runs at very high resolution now on my Windows 10, 64bit
one other thing i had to do was switch off the "waves" setting in the graphics because that one thing seems to cause all the see and sky textures to get very messed up