Hello,
Windows 98 remind me full of things.
You can download the DLL file from some websites and try it, but they may be full of ads (the websites, not the DLL).
(also, would it work if I just installed the files on a modern machine and copied them over? )
Yes, it should work. Create a new folder with a fake
Orbiter.exe file in, and point the installer to this folder.
So, only OrbiterSound related folders/files are shown.
Milouse