Unable to run JNLP file

Hello All,
I have Zorin OS 16.1 Core, and I'm trying to run a software program called ermineJ. As I understand it, I should be able to double-click on ermineJ.jnlp, which I have downloaded, and the program should launch. However, double-clicking on the file brings up the following dialog: "Do you want to run ermineJ.jnlp, or display its contents?" No matter which of the four options I click on, nothing happens. I've also tried right-clicking on the file and selecting Open With Other Application. Whether I choose Open JDK Java 8 Runtime or Open JDK Java 11 Runtime, nothing happens. If I type "java -version" in the terminal, I get the following output:

openjdk version "11.0.15" 2022-04-19
OpenJDK Runtime Environment (build 11.0.15+10-Ubuntu-0ubuntu0.20.04.1)
OpenJDK 64-Bit Server VM (build 11.0.15+10-Ubuntu-0ubuntu0.20.04.1, mixed mode, sharing)

Does anyone have any experience running ermineJ or JNLP files in Zorin? Any suggestions would be appreciated.

I would not know where to start with coding anything, but try this. Right-click the file and select properties. Then select permissions tab, then check mark "allow to run as a program". Can't remember exact wording, then try.

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Thanks for the suggestion. Unfortunately, it didn't work.

try:

cd [distination]
java ermineJ.jnlp

See if any error pops out of the terminal.

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Hi Storm,
Thanks for your suggestion. I tried what you said and got the following error:

Error: Could not find or load main class ermineJ.jnlp
Caused by: java.lang.ClassNotFoundException: ermineJ.jnlp

Been looking up. It seems that this app haven't been updated for 4 years. This may be an issue with later java version. Try a previous version of java.

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OK, thanks for the suggestion! It sounds like it could be an issue with the app itself.