Enable EXE and PKG files for WooCommerce digital downloads

add_filter( 'upload_mimes', function( $mimes ) {

	if( current_user_can( 'manage_woocommerce' ) ) {
		$mimes['exe'] = 'application/octet-stream';
		$mimes['pkg'] = 'application/octet-stream';
	}

	return $mimes;

} );
 
add_filter( 'wp_check_filetype_and_ext', function( $data, $file, $filename, $mimes ) {

	if( ! empty( $data['ext'] ) && ! empty( $data['type'] ) ) {
		return $data;
	}

	$wp_file_type = wp_check_filetype( $filename, $mimes );

	if( 'exe' === $wp_file_type['ext'] ) {
		$data['ext']  = 'exe';
		$data['type'] = 'application/octet-stream';
	} elseif ( 'pkg' === $wp_file_type['ext'] ) {
		$data['ext']  = 'pkg';
		$data['type'] = 'application/octet-stream';
	}

	return $data;

}, 10, 4 );