Viewing .tga Images

I have a program the just views images, when it tries to view .tga files, it says it's out of memory.

Here is the simple code I have when it does this.

public partial class FormMain : Form
  {
    public FormMain()
    {
      InitializeComponent();
    }

    private void ButtonBrowse_Click(object sender, EventArgs e)
    {
      OpenFileDialogMain.ShowDialog();
    }

    private void OpenFileDialogMain_FileOk(object sender, CancelEventArgs e)
    {
      TextBoxImage.Text = OpenFileDialogMain.FileName;
      PictureBoxMain.Image = Image.FromFile(TextBoxImage.Text);
    }
  }