Solve displaying of zipped file content on single-product page, more info here: https://woocommercecommunity.slack.com/archives/C1KAZ91E3/p1600320336188100

meta.php

<?php
/*
 * This code should be in the proper place of your_child_theme/woocommerce/single-product/meta.php file.
 * Hope this helps you, but still, enjoy at your own risk. :)
 */

/**
 * Single Product Meta
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/single-product/meta.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see         https://docs.woocommerce.com/document/template-structure/
 * @package     WooCommerce\Templates
 * @version     3.0.0
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
global $product;
?>
<div class="product_meta">
	<?php do_action( 'woocommerce_product_meta_start' ); ?>
	<?php if ( wc_product_sku_enabled() && ( $product->get_sku() || $product->is_type( 'variable' ) ) ) : ?>
		<span class="sku_wrapper"><?php esc_html_e( 'SKU:', 'woocommerce' ); ?> <span class="sku"><?php echo ( $sku = $product->get_sku() ) ? $sku : esc_html__( 'N/A', 'woocommerce' ); ?></span></span>
	<?php endif; ?>
	<?php echo wc_get_product_category_list( $product->get_id(), ', ', '<span class="posted_in">' . _n( 'Category:', 'Categories:', count( $product->get_category_ids() ), 'woocommerce' ) . ' ', '</span>' ); ?>
	<?php echo wc_get_product_tag_list( $product->get_id(), ', ', '<span class="tagged_as">' . _n( 'Tag:', 'Tags:', count( $product->get_tag_ids() ), 'woocommerce' ) . ' ', '</span>' ); ?>


	<?php do_action( 'woocommerce_product_meta_end' ); ?>

<?php
// ########################################

/**
 * Display files in zip file.
 *
 * @author Precious Omonzejele (CodeXplorer)
 * @param string $zip_full_path The absolute url path.
 * @param string $display (optional) any valid key of pathinfo(), default is extension.
 * @param bool   $avoid_duplicate (optional) set true if you don't want duplicate list, default is false.
 * @return mixed false if zip file couldn't be opened, string otherwise
 */
function pekky_break_down_zip( $zip_full_path, $display, $avoid_duplicate = false ) {
	// Divide file path.
	$path = explode( '/uploads/', $zip_full_path );
	if ( empty( $path ) ) {
		return false;
	}

	$file_path = WP_CONTENT_DIR . '/uploads/' . $path[1];

	$zip = new ZipArchive();

	$res  = $zip->open( $file_path );
	$data = '';
	// To detect if a file has been listed, to avoid repetition.
	$data_store = array();
	if ( true === $res ) {
		for ( $i = 0; $i < $zip->numFiles; $i++ ) {

			$info        = pathinfo( $zip->getNameIndex( $i ) );
			$single_info = $info[ $display ];

			// Does something exist and if avoid_duplicate is set, is it already listed?
			if ( $single_info ) {
				if ( $avoid_duplicate && in_array( $single_info, $data_store, true ) ) {
					continue;
				}
				$data_store[] = $single_info;
				$data        .= $single_info . ( ( $zip->numFiles - $i ) == 1 ? '' : ', ' );
			}
		}
		$zip->close(); // Always close this 👽.
		return $data;
	} else {
		return false;
	}
}
	// End of Custom Function.

	$downloads       = $product->get_downloads();
	$part_needed     = 'extension';
	$formats         = '';
	$avoid_duplicate = false; // Set to true if you do not want repititive info.

foreach ( $downloads as $key => $each_download ) {
	$file_path = $each_download['file'];
	$info      = pathinfo( $file_path );
	$f_data    = $info[ $part_needed ];

	echo '<br><br>';
	// Is it a zip file?
	if ( 'zip' === $f_data ) {
		$_format  = pekky_break_down_zip( $file_path, $part_needed, $avoid_duplicate );
		$formats .= ( ! empty( $_format ) ? $_format : '' );
	} else {
		$formats .= ( ! empty( $f_data ) ? $f_data . ', ' : '' );
	}
}
// Translators: %s is the format data.
$format_text = sprintf( __( 'file Format: %s', 'woocommerce' ), $formats );
echo ( ! empty( $formats ) ? '<p>' . esc_attr( $format_text ) . '</p>' : '' );
?>
</div>