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If 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.
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"
