INT 21 - DOS 1+ - RENAME FILE USING FCB
AH = 17h
DS:DX -> modified FCB (see also AH=0Fh)
the old filename ('?' wildcards OK) is in the standard location
while the new filename ('?' wildcards OK) is stored in the 11
bytes beginning at offset 11h
Return: AL = status
00h successfully renamed
FFh no matching files,file is read-only, or new name already exists
Note:   subdirectories may be renamed using an extended FCB with the
appropriate attribute
SeeAlso: AH=13h,AH=56h,INT 2F/AX=1111h

See also: 210F

2117 - DOS 1+ - RENAME FILE USING FCB