ZIP Files are not allowed in WordPress by default but you might want to have a way to upload them and unpack them. For example, how WordPress uploads and unpacks plugin ZIP files.
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WordPress File Upload with AJAX
WordPress is a great CMS and has a nice feature for uploading files. That is the media uploader which can be found inside the WordPress administration. In this tutorial we will not use the media uploader. We will develop our own WordPress file upload using AJAX and PHP.