I am currently writing a .net library for use with Wii Files and IO. I will be posting snippets and updates here.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Security.Cryptography;
using System.Text;
 
 
namespace Wii_Code_Examples
{
    public class WadInformation
    {
		public static string GetSystemCode(string titleId)
            {
                string code = String.Empty;
                switch (titleId[0].ToString())
                {
	                case "C":
                        code = "Commodore 64 Virtual Console.";
                        break;
 
                    case "D":
                        code = "Virtual Console Arcade.";
                        break;
 
                    case "E":
                        code = "NeoGeo Virtual Console.";
                        break;
 
                    case "F":
                        code = "Nintendo Virtual Console.";
                        break;
 
                    case "H":
                        code = "General Channel.";
                        break;
 
                    case "J":
                        code = "Super Nintendo Virtual Console.";
                        break;
 
                    case "L":
                        code = "Sega Master System Virtual Console.";
                        break;
 
                    case "M":
                        code = "Sega Megadrive Virtual Console.";
                        break;
 
                    case "N":
                        code = "Nintendo 64 Virtual Console.";
                        break;
 
                    case "P":
                        code = "TurboGraFX Virtual Console";
                        break;
 
                    case "Q":
                        code = "TurboGraFX CD Virtual Console.";
                        break;
 
                    case "R":
                        code = "Wii Disc.";
                        break;
 
                    case "W":
                        code = "WiiWare.";
                        break;
 
                    case "X":
                        code = "MSX Virtual Console.";
                        break;
                }
 
                return code;
            }
    }
 
    class WadFileClass
    {
        public const long CONST_TITLEID = 0xc20L; //Length: 4
        public const long CONST_TMDSIZE = 0x014; //Length: 4
        public const long CONST_APPSIZE = 0x018; //Length: 4
        public const long CONST_WADTYPE = 0x004; //Length: 4
 
        private static byte[] _PublicKey;
        private static byte[] PublicKey
        {
            get 
            {
                if (_PublicKey == null)
                {
                    _PublicKey = File.ReadAllBytes(@"C:\common-key.bin");
                }
                return _PublicKey; 
            }
        }
 
        /// <summary>
        /// This is the wad file data.
        /// </summary>
        public static byte[] FileData;
 
        /// <summary>
        /// Reads the file data. This needs to be done first for Data to populate in this class.
        /// </summary>
        /// <param name="fileLocation">The file location.</param>
        public static void ReadFileData(string fileLocation)
        {
            FileData = File.ReadAllBytes(fileLocation);
        }
 
        /// <summary>
        /// This is the raw unencrypted file data inside the wad.
        /// </summary>
        private byte[] _UnencryptedBlock;
        public byte[] UnencryptedBlock
        {
            get 
            {
                if (_UnencryptedBlock == null)
                {
                    // pull block here
                }
                return _UnencryptedBlock; 
            }
        }
 
        public static string CommonKey
        {
            get 
            {
                StringBuilder sbString = new StringBuilder();
                foreach (byte b in PublicKey)
                {
                    sbString.Append(Convert.ToChar(b));
                }
                return Convert.ToString(sbString);
            }
        }
 
        public static string GetWadInfo(string fileLocation, long address, int length)
        {
            byte[] bytes = new byte[length];
            using (FileStream input = new FileStream(fileLocation, FileMode.Open))
            {
                FileStream fs = input;
                fs.Seek(address, SeekOrigin.Begin);
                fs.Read(bytes, 0, length);
            }
 
            StringBuilder sbString = new StringBuilder();
            foreach (byte b in bytes)
            {
                sbString.Append(Convert.ToChar(b));
            }
            return Convert.ToString(sbString);
        }
 
        public static void ReadCryptedArea()
        {
            if (FileData != null)
            {
 
            }
        }
 
    }
}
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