the uploader

custom-uploader-markup.php

<?php

		echo '<tr class="addon-file-field">';
			echo '<th>';
				echo '<label for="addon-file">'.__( 'ZIP file', '' ).'</label>';
			echo '</th>';
			echo '<td>';
				echo '<input type="text" name="addon-meta[file]" id="addon-file" class="widefat" value="'.esc_url( $file ).'">';
			echo '</td>';
		echo '</tr>';

		echo '<tr class="addon-file-button">';
			echo '<th>&nbsp;</th>';
			echo '<td>';
				echo '<input data-uploader_title="'.__( 'Select A File', '' ).'" data-uploader_button="'.__( 'Select', '' ).'" class="button button-secondary addon-file-upload" type="button" value="'.__( 'Add File', '' ).'">';
			echo '</td>';
		echo '</tr>';

custom-uploader.js

//********************************************************
// now start the engine
//********************************************************
jQuery(document).ready( function($) {


//********************************************************
// media uploader for 3.5
//********************************************************

	// Uploading files
	var file_frame;

	jQuery( 'tr.addon-file-button' ).on('click', 'input.addon-file-upload', function( event ){

		event.preventDefault();

		//get my field ID for later
		var fieldbox = jQuery( 'div#add-on-file' ).find( 'input#addon-file' );

		// If the media frame already exists, reopen it.
		if ( file_frame ) {
			file_frame.open();
			return;
		}

		// Create the media frame.
		file_frame = wp.media.frames.file_frame = wp.media({
			title: jQuery( this ).data( 'uploader_title' ),
			button: {
				text: jQuery( this ).data( 'uploader_button' )
			},
			multiple: false
		});

		// When an image is selected, run a callback.
		file_frame.on( 'select', function() {
			// We set multiple to false so only get one item from the uploader
			attachment = file_frame.state().get('selection').first().toJSON();

			// clear the existing value
			jQuery( fieldbox ).val( '' );

			// Populate the field with the file URL
			jQuery( fieldbox ).val( attachment.url );

		});

		// Finally, open the modal
		file_frame.open();
	});

//********************************************************
// that's all folks. we're done here
//********************************************************

});