I tried in windows 10 and windows 7 x64 . I have .NET FRAMEWORK 4.5 When I open ML file : ************** Exception Text ************** System.Exception: Unknown AvalonIO volume type detected. at AvalonIO.STFS.MetaData..ctor(IO IO) at AvalonIO.STFS.STFS.Read() at AvalonIO.STFS.STFS..ctor(String FileName) at Pro_Evolution_2014.Form1.saveMasterLigueToolStripMenuItem_Click(Object sender, EventArgs e) at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e) at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ToolStrip.WndProc(Message& m) at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)