INT 21 - DOS 4.x only - GET EXTENDED ATTRIBUTES FOR FILE
        AX = 5702h
        BX = file handle
        CX = size of result buffer or 0000h
        DS:SI -> EAP list (see below)
        ES:DI -> buffer for returned EAV list (see below)
Return: CF clear if successful
            CX = size of returned data
        CF set on error
            AX = error code (see AH=59h)
Desc:   get the current value of one or more extended attributes
Notes:  if CX=0000h on entry, ES:DI is ignored and no data is actually
          returned, only the amount of data which is available
        the default DOS 4 behavior is to return a single word of 0000h (no
          structures) in the result buffer if CX>=0002h on entry
SeeAlso: AX=5703h,AX=5704h,AH=6Eh,INT 2F/AX=112Dh

Format of EAP (extended attribute properties) list:
Offset  Size    Description
 00h    WORD    number of EAP structures following
 02h    var     array of EAP structures (see below)

Format of EAP (extended attribute property) structure:
Offset  Size    Description
 00h    BYTE    attribute type
                01h boolean (either 00h or 01h)
                02h number (BYTE, WORD, or DWORD)
                03h string
                04h date stamp
                05h time stamp
 01h    WORD    EAP flags (see below)
 03h    BYTE    size of reference string (name)
 04h  N BYTEs   reference string

Bitfields for EAP flags:
 bit 12 unchangeable
 bit 13 ignore
 bit 14 unchangeable
 bit 15 used by COMMAND.COM for code page, but not understood by ATTRIB

Format of EAV (extended attribute value) list:
Offset  Size    Description
 00h    WORD    number of EAV structures following
 02h    var     array of Extended Attribute Value structures

Format of Extended Attribute Value structures:
Offset  Size    Description
 00h  4 BYTEs   ???
 04h    BYTE    size of reference string
 05h    WORD    size of value
 07h    var     reference string
        var     value

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