Replace HDR

private void ReplaceMapsHDR(byte players)
{
    if (Panel4.Visible == false) {
        return;
    }
    string populousin = null;
    populousin = My.Computer.Registry.GetValue("HKEY_LOCAL_MACHINE\\SOFTWARE\\Bullfrog Productions Ltd\\Populous: The Beginning", "InstallPath", "");
    try {
        foreach (string fileFullPath in Directory.GetFiles(populousin + "\\levels")) {
            string file = Path.GetFileName(fileFullPath);
            if (Path.GetExtension(file.ToLower()) == ".hdr") {
                if (file.Replace("levl20", null).Replace(".hdr", null) <= 25 == false) {
                    BinaryWriter writer = new BinaryWriter(new FileStream(populousin + "\\levels\\" + file, FileMode.Open));
                    writer.BaseStream.Position = 88;
                    writer.Write(players);
                    writer.Close();
                }
            }
        }
    } catch {
    }
}