Export Workflow for External Users

I am certain that this is a silly question, but I want to export a template of a workflow to use in class with my students. I have seen .knar files shared on this forum (and on Community) which open up the workflow and also will prompt users to install the necessary extensions if applicable.

I am creating a basic workflow to show students the basics of KNIME, but I do not see the option for a .knar file, only .knwf when exporting a workflow.

My question: When is a ,knar file generated, and what is the recommended way to share example workflows for external users (i.e. students)? I want to reduce as much friction as possible, and am a little confused about these file types.

Thanks in advance.