To run Java sessions with Java Web Start, you need the Java Runtime Environment (JRE) 1.6 or higher.
If you want to run Java Web Start sessions through a standard browser, the Web server to which you published the Web Start sessions must recognize the .JNLP extension and MIME type, application/x-java-jnlp-file. If the server does not already recognize this type of file, you must add it manually.