Virtually anyone has encountered some problems with opening unknown files while working on a computer. It can be very frustrating. Yet such problems, not only with JNLP files, can be addressed in a standard way. Follow the steps below and we can guarantee that your problem with opening JNLP will be resolved!
An Internet file with the extension .JNLP allows you to run and use Java programs in your web browser. It stores data in XML format regarding the remote address for downloading the Java program (.JAR file) and the initial class for running it using the JRE.
If given user account does not have necessary permissions to open files with JNLP extension, it is highly probable that no program that supports given files is installed on the users’ system. Below is a list of actions user should pursue in order to resolve most common problems.
After the application has been installed, the system should automatically open JNLP files with given application. Below is the list of relevant programs along with operating systems they are available for:
It is possible that an application that supports JNLP files is not associated with such files. In such case, the program should by manually associated with JNLP files (right-click on the file icon → Properties → General Tab → In submenu "Open with" and click on "Change" button. System will display a list of suggested programs that support JNLP files. Choose the application by checking the box "Always use the selected application to open this kind of files". System will store this information in its registry and use it to open JNLP files with the selected program.
File association for JNLP files can be edited manually by editing appropriate entry in Windows System Registry. However, it is discouraged as it may introduce errors to registry if not done properly and may even damage the system.