Testfile CJK - result is empty ?

I am doing some test with iconv, to see what characters can be converted. To do this, I am creating a list of chinese characters, according to the list here.

For blocks 1 and 2 this works as expected.

But for some reason, blocks 3, 4 and 5 does not return a byte for the chinese character.

Am I missing something ?

My code :

$of = FileOpen("utf_block4.txt", 2+128) ; 32 = UTF16LE, 128 = UTF8 BOM
$myvar = ""

for $i = 0x2A700 to 0x2B734
        $myvar &= hex($i, 6) & " : >" & ChrW($i) & "<" & @CRLF
Next

FileWrite($of, $myvar)
FileWriteLine($of, "")
FileClose($of)

Edit: the forum won't let me post what I should get for the code.

Working version of block 1, first 5 lines - to see example output - is:

4E00 : >一<
4E01 : >丁<
4E02 : >丂<
4E03 : >七<
4E04 : >丄<