Well apparently nothing like this exists. However I found a class that
will return the mime type of a file. Source and source code below.
using System;
using System.IO;
using System.Runtime.InteropServices;

/// <summary>
/// Utility class contains static method checkType to determine Mime
Type
/// Found at http://blogs.msdn.com/bwaldron/archive/2005/01/04/346547.aspx
/// </summary>
public class MimeTypeUtil
{
   [DllImport(@"urlmon.dll", CharSet = CharSet.Auto)]

   private extern static System.UInt32 FindMimeFromData(
        System.UInt32 pBC,
        [MarshalAs(UnmanagedType.LPStr)] System.String pwzUrl,
        [MarshalAs(UnmanagedType.LPArray)] byte[] pBuffer,
        System.UInt32 cbSize,
        [MarshalAs(UnmanagedType.LPStr)] System.String
pwzMimeProposed,
        System.UInt32 dwMimeFlags,
        out System.UInt32 ppwzMimeOut,
        System.UInt32 dwReserved);

   public static string CheckType(string filePath)
   {
       byte[] buffer = new byte[256];

       // grab the first 256 bytes on the file
       using (FileStream fileStream = new FileStream(filePath,
FileMode.Open))
       {
           if (fileStream.Length >= 256)
           {
               fileStream.Read(buffer, 0, 256);
           }
           else
           {
               fileStream.Read(buffer, 0, (int)fileStream.Length);
           }
       }

       try
       {
           System.UInt32 mimeType;
           System.UInt32 returnValue = FindMimeFromData(0, null,
buffer, 256, null, 0, out mimeType, 0);
           System.IntPtr mimeTypePointer = new IntPtr(mimeType);

           return Marshal.PtrToStringUni(mimeTypePointer);
       }

       catch (Exception ex)
       {
           return ex.Message;
       }
   }
}