OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() != DialogResult.OK)
return;

FileStream bcsvFile = File.Open(ofd.FileName, FileMode.Open);
List bytes = new List();
String str;
int stringOffset = 0;
int strOffs = 0;
int strCount = 0;

while (bcsvFile.ReadByte() != 0)
{
bcsvFile.Seek(stringOffset + strOffs + strCount, SeekOrigin.Begin);
bytes.Add((SByte)bcsvFile.ReadByte());
strCount++;
}

unsafe
{
fixed (SByte* strData = bytes.ToArray())
{
str = new String(strData, 0, bytes.ToArray().Length, System.Text.Encoding.GetEncoding("Shift-JIS"));
}
}

MessageBox.Show(str);