A Chrome Web Store extension that allows you to run JNLP files directly in the browser without a local Java installation. Comparison of Methods OpenWebStart (Recommended) Java 8 (Legacy) CheerpJ (Extension) Windows 11 Support Partial (Compatibility mode) Full (In-browser) Security High (Active updates) Low (Outdated) High (Sandboxed) Ease of Use One-time setup Requires manual config Java Version Supports Java 8 - 21+ Stuck on Java 8

For users who cannot install software on their machine, some browser-based tools can emulate the launcher environment.

Understanding the target app can help determine if it requires a specific legacy Java version. What is Java Web Start and how is it launched?

If the file doesn't open automatically:

Right-click your .jnlp file > > Choose another app .

Run the installer and follow the prompts. It includes a "JVM Manager" that can automatically download the specific Java version required by your application.

Since Oracle's original javaws is deprecated and lacks security updates, is the industry-standard replacement for Windows 11.

Visit the OpenWebStart Downloads page and select the Windows 64-bit installer (.msi or .exe).