If you need to view a Java Web Start JNLP descriptor in a human-readable format, Anywhere JNLP Viewer web-based application may come in handy.
With Anywhere JNLP Viewer, you can
inspect JNLP document preview, view icon, splashscreen,
application security settings, and other info.
Anywhere JNLP Viewer will also check submited URL
for compliance against Java's Webstart requirements: valid XML,
application/x-java-jnlp-file MIME content-type.
Please enter an URL of the JNLP-descriptor you want to view:
Or see an example.