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Add File Version (AFV) can automatically or manually add file version to the CSS/JS files that were added using wp_enqueue_style and wp_enqueue_script, admin_enqueue_style and admin_enqueue_script.
The AUTO mode adds file version based on PHP file modification time, while the MANUAL mode adds version based on your input to the target files (CSS/JS).
Screenshots
screenshot-1.jpg shows the plugin administration page, where you can change and alter its settings.
screenshot-2.jpg shows the plugin sample output (HTML source)