Content-Type setting for downloading using dropbox api v2

I am able to run the following C# sample from our .NET tutorials page.  It assumes a file named "file.txt" in the root folder of your Dropbox account.

using System;
using System.Threading.Tasks;
using Dropbox.Api;

namespace sampleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var task = Task.Run((Func<Task>)Program.Run);
            task.Wait();
        }

        static async Task Run()
        {
            using (var dbx = new DropboxClient("<OAuth Token>"))
            {
                using (var response = await dbx.Files.DownloadAsync("/file.txt"))
                {
                    Console.WriteLine(await response.GetContentAsStringAsync());
                }
            }
        }
    }
}

If you are doing this on mobile, are you using a framework like Xamarin?