Altered dsetup.dll most likely links against one of Microsoft's C/C++ libraries ("msvc redistributable") from long after they stopped supporting win98. Depends on the compiler the devs use, essentially. For comparison, winXP was no longer supported by default with MS's 2012 compiler (iirc).
Lobby the devs to dig up an ancient compiler, make any tweaks necessary to the code for compatibility, and go out of their way to compile a special version of dsetup.dll every patch just for you. That is your only option short of logging in on another server instead.
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