Since Windows 10 version 1607 long paths are allowed and it is usually set in the registry like this by default:

HKLM/SYSTEM/CurrentControlSet/Control/FileSystem/LongPathsEnabled = 0x01 (REG_DWORD)

ITK still checks for old path lengths and it bites us again in our CI currently. We can opt-out by setting ITK_SKIP_PATH_LENGTH_CHECKS to ON.