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Get Content Type by Extension

using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Win32; using System.Security; class Utilities {     public static string GetContentType(string extension)     {         string mimeType = "application/unknown";         try         {             RegistryKey regKey = Registry.ClassesRoot.OpenSubKey(extension, false);             if (regKey != null && regKey.GetValue("Content Type") != null)                 mimeType = regKey.GetValue("Content Type").ToString();             else             {                 switch (extension)                 {                     case ".xap":                         mimeType = "application/x-silverlight-app";                         break;                 }             }             return mimeType;         }         catch (SecurityException)         {         }         switch (extension)         {             case ".docx":             case ".doc":                 mimeType = "application/msword";                 break;             case ".jpg":             case ".jpeg":                 mimeType = "image/jpeg";                 break;             case ".png":                 mimeType = "image/png";                 break;         }         return mimeType;     } }