Hiromi,
If I understand it correctly you have installed the full installer of MapWindow.
Can you upgrade your binaries using this procedure: http://www.mapwindow.org/phorum/read.php?4,24284
Next start MapWindow, not your own application and open the shapefile.
If you don't have trouble opening the shapefile the problem is in your application.
If you do have trouble the problem might be with your shapefile.
Either way can you send me the source code of your application and the shapefile so I can have a look?
Please send it to bontepaarden[AT]gmail[D0T]com
Paul
If I understand it correctly you have installed the full installer of MapWindow.
Can you upgrade your binaries using this procedure: http://www.mapwindow.org/phorum/read.php?4,24284
Next start MapWindow, not your own application and open the shapefile.
If you don't have trouble opening the shapefile the problem is in your application.
If you do have trouble the problem might be with your shapefile.
Either way can you send me the source code of your application and the shapefile so I can have a look?
Please send it to bontepaarden[AT]gmail[D0T]com
Paul