Actually, I believe we cannot provide romsets through the forum, for a fact of ethics.
BUT
I checked the mameinfo.dat about Operation Wolf to see if something was added or changed exclusively in the parent romset (World set 1), since then.
Nothing suspicious; lot of improvement and lot of clones but files should be the same since then. I tried to run the "opwolf romset for wolf 0.180" INTO wolf 0.103 (sorry I don't have 0.98 but I make my guess nothing changes, as mameinfo.dat tells me) and it worked.
My point is that you should have the proper romset already and, instead, it actually depends on the evergreen trouble that afflicts running old versions of the emulator on newest operating systems.

Just try to actually see if you can run *any* game at all on your wolf 0.98.