Having trouble communicating to a FT232R device

I have a FT232R device controlled by a VXM Stepping Motor Controller. I was able to communicate with the device on Mac(using Matlab). But I'm having trouble doing it on Windows.

I installed the VCP driver for Windows 64-bit from here: http://www.ftdichip.com/Drivers/VCP.htm I already checked that the driver is properly installed.

Here is my code:

#include <windows.h>
#include <setupapi.h>

#include <stdio.h>
int main()
{

   char command[34] = "I2M10,R";
   HANDLE hSerial = CreateFile(
                    "\\.\COM8", FILE_SHARE_READ | FILE_SHARE_WRITE, 0, NULL,//pass path as a parameter instead of \\.\COM6
                    OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
   if (hSerial == INVALID_HANDLE_VALUE)
   {
      fprintf(stderr, "Erro");
   }
   else fprintf(stderr, "OKn");

   DWORD bytes_written = 0;
   BOOL res = WriteFile(hSerial, command, 34, &bytes_written, NULL);
   if (res == false || bytes_written != 34) {
        printf("error in write file");
   }

   res = CloseHandle(hSerial);
   if (res == false) {
       printf("error in close handler");
   }
   retu 0;
}

There is no error in the functions I use, but when I run the program nothing happens. I also checked the command I sent and I'm sure it is correct. I created a new Win32 Console Application in VS 2015 and I build it using 'x64'. Do you have ideas on what could be the problem ?

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