C#获取系统文件、文件夹和磁盘驱动器图标

/// <summary>
/// 获取文件扩展名说明
/// </summary>
/// <param name="ext"></param>
/// <returns></returns>
public static string GetFileTypeDescription(string ext)
{
RegistryKey rKey = null;
RegistryKey sKey = null;
string FileType = "";
try
{
rKey = Registry.ClassesRoot;
sKey = rKey.OpenSubKey(ext);
if (sKey != null && (string)sKey.GetValue("", ext) != ext)
{
sKey = rKey.OpenSubKey((string)sKey.GetValue("", ext));
FileType = (string)sKey.GetValue("");
}
else
{
FileType = ext.Substring(ext.LastIndexOf('.') + 1).ToUpper() + " File";
}
return FileType;
}
finally
{
if (sKey != null)
sKey.Close();
if (rKey != null)
rKey.Close();
}
}