Ignorance, and terrible design, abounds–

NTFS stores file names in Unicode. –The Horse’s Mouth :(

–and–

NTFS allows any sequence of 16-bit values for name encoding (file names, stream names, index names, etc.) except 0x0000. This means (case insensitive) UTF-16 code units are supported, but the file system does not check whether a sequence is valid UTF-16 (it allows any sequence of short values, not restricted to those in the Unicode standard) –Wackypardia