Right now in TOP 500 there is only Linux, but in past there was even Mac OS X supercomputers. Last time Windows Supercomputer was in TOP500 was 2015 year. There is supercomputers that run on Windows now, just they are not in TOP 500.
As I feared, the most recent version of DiskGenius, 6.0.0.1631, no longer works on XP, even the portable version.
"The procedure entry point inet_ntop could not be located in the dynamic link library WS2_32.dll"
The last working version (portable only, the installer does not work on XP) is 5.6.1.1580.