INT 21 - Novell NetWare v3+ - MAP DIRECTORY NUMBER TO PATH
        AX = F217h subfn F3h
        CX = length of request buffer in bytes
        DX = length of reply buffer in bytes
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
        reply buffer filled
SeeAlso: AX=F217h/SF=F4h

Format of request buffer:
Offset  Size    Description
 00h    WORD    0007h (length of following data)
 02h    BYTE    F3h (subfunction "Map Directory Number to Path")
 03h    BYTE    volume number
 04h    DWORD   directory entry number
 08h    BYTE    name space type

Format of reply buffer:
Offset  Size    Description
 00h    BYTE    directory path length
 01h  N BYTEs   directory path (NetWare style, separated by length descriptors
                rather than slashes or backslashes)

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