Int 21 Fn 440D  - Ms-dos 7.0 - Generic Ioctl - Enumerate Open Files        [D]

   AX = 440Dh
   CX = 086Dh (category code 08h, minor code 6Dh)
   BL = drive number (00h=default,01h=A:,etc)
   DS:DX -> buffer for ASCIZ pathname
   SI = file index (0000h to number of open files-1)
   DI = enumeration type (0000h all files, 0001h unmovable files)

Return: CF set on error
       AX = error code (01h,02h,12h,etc.) (see #1366 at AH=59h/BX=0000h)
       0012h if file index is out of range
   CF clear if successful
       AX = file open mode (BX from AX=6C00h or AX=716Ch)
       CX = file type (see #1264)

See Also: AX=440Dh"DOS 3.2+",AX=440Dh/CX=084Ah,AX=440Dh/CX=086Ch

See Also: AX=440Dh/CX=086Eh,AX=6C00h,AX=716Ch

(Table 1264)
Values for file type:
 0000h normal file
 0001h memory-mapped file (unmovable)
 0002h unmovable file
 0004h swap file