I've put all my plugin files in one directory (e.g., "/wp-content/plugins/my-plugin") and can have the files link to each other by doing something like
That works fine, but if I want to attach some arguments like this
I get a blank page with the error: "Cannot load /my-plugin/scriptA.php?id=38."
I've tried using the HTML entities in the link instead of just a ? and &, but that didn't change anything.