NTFS has always been case sensitive, Windows API just lets you treat it as case insensitive. If you pass `FILE_FLAG_POSIX_SEMANTICS` to `CreateFile` you can make files that differ only in case.
Good luck using those in some tools which use the API differently though. Windows filenames are endless fun. What's the maximum length of the absolute path of a file? Why, that depends on which API you're using to access it!
