Tried it out on 98SE, was able to boot without problems (my MSVCRT.dll is 6.10.9848.0). Unfortunately any Firefox versions (and other Gecko/Goanna-based browsers) that were working before didn't start. I tried adding Kexstubs in CORE.ini, but after that they all started crashing on start, with problem being, apparently, kexbasen.dll, address 0167:7d011b65. Replacing it with the one from version 24 didn't do anything, so I reverted back for now.