1. Necesito convertir un archivo PDF en un archivo txt.file. Mi comando parece funcionar, ya que aparece el texto convertido en la pantalla, pero de alguna manera soy incapaz de dirigir la salida a un archivo de texto.

public static string[] GetArgs(string inputPath, string outputPath)
{ 
    return new[] {
                "-q", "-dNODISPLAY", "-dSAFER",
                "-dDELAYBIND", "-dWRITESYSTEMDICT", "-dSIMPLE",
                "-c", "save", "-f",
                "ps2ascii.ps", inputPath, "-sDEVICE=txtwrite",
                String.Format("-sOutputFile={0}", outputPath),
                "-c", "quit"
    }; 
}

2.¿Hay un .ic Unicode speficic?

Actualizar: Al publicar mi Código completo, tal vez el error esté en otra parte.

public static string[] GetArgs(string inputPath, string outputPath)
{
    return new[]    
    {   "-o c:/test.txt",    
        "-dSIMPLE",
        "-sFONTPATH=c:/windows/fonts",
        "-dNODISPLAY",
        "-dDELAYBIND",
        "-dWRITESYSTEMDICT",
        "-f",
        "C:/Program Files/gs/gs9.05/lib/ps2ascii.ps",               
        inputPath,
    };
}

[DllImport("gsdll64.dll", EntryPoint = "gsapi_new_instance")]
private static extern int CreateAPIInstance(out IntPtr pinstance, IntPtr caller_handle);

[DllImport("gsdll64.dll", EntryPoint = "gsapi_init_with_args")]
private static extern int InitAPI(IntPtr instance, int argc, string[] argv);

[DllImport("gsdll64.dll", EntryPoint = "gsapi_exit")]
private static extern int ExitAPI(IntPtr instance);

[DllImport("gsdll64.dll", EntryPoint = "gsapi_delete_instance")]
private static extern void DeleteAPIInstance(IntPtr instance);`

private static object resourceLock = new object();

private static void Cleanup(IntPtr gsInstancePtr)
{
    ExitAPI(gsInstancePtr);
    DeleteAPIInstance(gsInstancePtr);
}

private static object resourceLock = new object();

public static void ConvertPdfToText(string inputPath, string outputPath) 
{ 
    CallAPI(GetArgs(inputPath, outputPath));
}

public static void ConvertPdfToText(string inputPath, string outputPath) 
{ 
    CallAPI(GetArgs(inputPath, outputPath));
}

private static void CallAPI(string[] args)      
{       
    // Get a pointer to an instance of the Ghostscript API and run the API with the current arguments       
    IntPtr gsInstancePtr;   
    lock (resourceLock)     
    {           
        CreateAPIInstance(out gsInstancePtr, IntPtr.Zero);      
        try
        {
            int result = InitAPI(gsInstancePtr, args.Length, args);                    
            if (result < 0)     
            {
                throw new ExternalException("Ghostscript conversion error", result);        
            }       
        }           
        finally     
        {               
            Cleanup(gsInstancePtr);     
        }       
    }   
}