Including the following entries in the FTDIPORT.INF file for the VCP driver before installation enables modem emulation mode:
[FtdiPort232.NT.HW.AddReg]
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HKR,,"EmulationMode",0x00010001,0x0000nnnn
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This creates a registry entry under
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\FTDIBUS\{Device VID, PID and serial number}\0000\Device Parameters\EmulationMode
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Please see AN232B-09 Using the Modem Emulation Mode in FTDI's VCP Driver for additional information on modem emulation mode.