Quote Originally Posted by Flatline View Post
Your file association for .xml files might not be completely set. I'm not sure which one myseq uses, but it could either be the Open funcion or the Edit function. Open is set via the right click -> open with command in explorer. Edit may or may not be set. You can check by using ShellMenuView. http://www.nirsoft.net/utils/shell_menu_view.html

To make things easy, I'd suggest installing something like Editpad or Notepad+ and just letting it set file associations correctly.
MySEQ is hardcoded to use notepad, installing other programs or changing file associations won't help.