JNLP files not opening

October 26, 2025 at 11:36 AM

Official Post

f you have the issue that JNLP files don't open correctly anymore with Java simply copy the code below in a .reg file and import it to your registry.

Pay attention that this example here is for the Java 8 Update 201 (last free version) version and you may need to update the path to your jp2launcher.exe file.

Code

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\JNLPFile]
@="JNLP File"
"EditFlags"=dword:00010000

[HKEY_CLASSES_ROOT\JNLPFile\Shell]

[HKEY_CLASSES_ROOT\JNLPFile\Shell\Open]
@="&Launch"

[HKEY_CLASSES_ROOT\JNLPFile\Shell\Open\Command]
@="\"C:\\Program Files (x86)\\Java\\jre1.8.0_201\\bin\\jp2launcher.exe\" -securejws \"%1\""

[HKEY_CLASSES_ROOT\jnlp]
@="URL:jnlp Protocol"
"URL Protocol"=""

[HKEY_CLASSES_ROOT\jnlp\Shell]

[HKEY_CLASSES_ROOT\jnlp\Shell\Open]

[HKEY_CLASSES_ROOT\jnlp\Shell\Open\Command]
@="\"C:\\Program Files (x86)\\Java\\jre1.8.0_201\\bin\\jp2launcher.exe\" -securejws \"%1\""

[HKEY_CLASSES_ROOT\.jnlp]
@="JNLPFile"
"Content Type"="application/x-java-jnlp-file"

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