JNLP (Java Network Launch Protocol) is an XML-based protocol that can be used to deploy Java and JavaFX applications on the Internet.

Although this is sometimes done automatically for browsers,  they must be configured to accept the MIME type. If your browser does not recognize the jnlp file extension then you may have to set it to enable the launch of Java Web Start.

The MIME type application/x-java-jnlp-file is mapped to files with the jnlp extension 

To find out more on how to deploy a java web start app you may want to have a look at the tutorial here below:

--http://java.sun.com/docs/books/tutorial/deployment/webstart/deploying.html

• GNU/Linux, Unix variants, and Windows NT or later