Dir Functions inconsistent behaviour with VolumeName as source

[ResNullius]

AutoIt Release 3.3.12.0 & latest Beta 3.3.13.15
Tested on both Win 7 x64 and x86 systems
When using a Volume Name (
?\Volume{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}\) as the source for Dir operations, the DirCopy, DirMove, & DirRemove functions fail. DirCreate and DirGetSize work as expected as do FileCopy and FileMove functions, although FileFindNextFile fails.
I would expect some consistency; either all operations fail, Dir & File, or all succeed.

$sVolumeName = _GetVolumeNameForVolumeMountPoint("C:\")
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $sVolumeName = ' & $sVolumeName & @CRLF) ;### Debug Console

$sVolumeNameTestDir = $sVolumeName & "~testDir~"
$sTestFile = $sVolumeNameTestDir & "\~File1.txt~"

$iCreate = DirCreate($sVolumeNameTestDir) ;this works to create a folder on VolumeName destination
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iCreate = ' & $iCreate & @CRLF) ;### Debug Console

$iFileCreate = FileClose(FileOpen($sTestFile, 2)) ;this works, creating a file in VolumeName Destination
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iFileCreate = ' & $iFileCreate & @CRLF) ;### Debug Console


$iWrite = FileWriteLine($sTestFile, "line one") ;this works, writing to a file in VolumeName destination
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iWrite = ' & $iWrite & @CRLF) ;### Debug Console

$iFileCopy = FileCopy($sTestFile, $sVolumeNameTestDir& "\~file2.txt~") ; this works, copy a file using VolumeName as source and destination
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iFileCopy = ' & $iFileCopy & @CRLF) ;### Debug Console


$iFileCopy2 = FileCopy($sTestFile, @TEMPDIR, 1) ;this works copying a file from VolumeName source
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iFileCopy2 = ' & $iFileCopy2 & @CRLF) ;### Debug Console

$iSize = DirGetSize($sVolumeNameTestDir) ;this works, getting size of folder in VolumeName source
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iSize = ' & $iSize & @CRLF) ;### Debug Console

$iDirCopy = DirCopy($sVolumeNameTestDir, @TEMPDIR, 1) ;this fails, copying a folder from VolumeName source
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iDirCopy = ' & $iDirCopy & @CRLF) ;### Debug Console

$iMove = DirMove($sVolumeNameTestDir, @TEMPDIR & "\~TESTDIR_MOVED", 1) ;this fails, but does create an empty target dir
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iMove = ' & $iMove & @CRLF) ;### Debug Console

$iRemove = DirRemove($sVolumeNameTestDir, 1) ;this fails
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iRemove = ' & $iRemove & @CRLF) ;### Debug Console

Local $hSearch = FileFindFirstFile($sVolumeNameTestDir & "\*.*") ;FindFirstFile succeeds, but FindNextFile fails to find anything
    If $hSearch = -1 Then
        ConsoleWrite("Error: No files/directories matched the search pattern." & @CRLF)
		Else
    Local $sFileName = "", $iResult = 0
    While 1
        $sFileName = FileFindNextFile($hSearch) ;FindNextFile Fails
        If @error Then
					ConsoleWrite("No more files: exiting... FAIL here" & @CRLF)
					ExitLoop
				EndIf
        $iResult = MsgBox(7096, "", "File: " & $sFileName)
         WEnd
    FileClose($hSearch)
EndIf

$iDosMove = RunWait(@Comspec & ' /k Move "' & $sVolumeNameTestDir & '" ' & @TempDir) ;this works :-)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $iDosMove = ' & $iDosMove & @CRLF) ;### Debug Console


Func _GetVolumeNameForVolumeMountPoint($sMountPoint)
    Local $tBuffer, $pBuffer, $aCall
    $tBuffer = DllStructCreate("wchar buffer[256]")
    $pBuffer = DllStructGetPtr($tBuffer)
    $aCall = DllCall("kernel32.dll", "bool", "GetVolumeNameForVolumeMountPointW", "wstr", $sMountPoint, "ptr", $pBuffer, "dword", 256)
    If @error Then
        ConsoleWrite("! ERROR: " & @error & @CRLF)
        Return SetError(1, 0, -1)
    EndIf
    Return DllStructGetData($tBuffer, 1)
EndFunc

[Jon]

Documented here:
​http://www.autoitscript.com/forum/topic/162588-extended-length-support-in-file-functions-beta-for-reference/