This finding comes from a usability study.

Users were asked to install Java in order to run a WebStart application. After the kernel installation, Open JNLP file dialog appeared. The users were confused by this dialog, since they were not aware of file they are going to run.

For current appearance of the Open JNLP file dialog, see the attachment.

I think it would help if the "which is a: JNLP file" string is changed to "which is a: Java Web Start Application", so the users can understand they're going to run a Java application.