When you run an EXE file, it uses Windows OS support. Similarly, when you run JAVA or JAR files, you need the help of Java Framework to open them.

How to Open a JNLP File. Oracle's Java plug-in supports Java Network Launch Protocol files, which point to Java applets or applications. With Java installed, you can click a link to a JNLP file on ...

Open the Eclipse Java programming software from the Windows menu. Open your Java project in the Eclipse software to view all of your project files.