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INT 2F - Multiplex - NETWORK REDIRECTOR - FINDFIRST
        AX = 111Bh
        SS = DS = DOS CS
        [DTA] = uninitialized 21-byte findfirst search data (see INT 21/AH=4Eh)
        SDA first filename pointer -> fully-qualified search template
        SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
            AX = DOS error code (see INT 21/AH=59h)
        CF clear if successful
            [DTA] = updated findfirst search data
                    (bit 7 of first byte must be set)
            [DTA+15h] = standard directory entry for file
Note:   called by DOS 3.1+ kernel
SeeAlso: AX=111Ch, INT 21/AH=4Eh, INT 21/AH=60h