As would creating the jar file and deleting the manifest file. I'm looking for a jar command line - what switches, options, what parameters - would create a jar file without a manifest file.

Hopefully, you can resolve the issue using the solutions mentioned in this post. Read: How to open or run a JAR file on Windows? How do I fix Java is not recognized as an internal or external ...

How to install Java on your computer To run Java apps, open JAR files or compile some source code into bytecode you’ll need to install Java. To download and install Java on Windows, MacOS or Ubuntu, ...

Here's a quick example of how to use Java's jarsigner to digitially sign JAR files.