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What is an NZB file?

NZB is an XML-based file format for retrieving posts from usenet. Each usenet message has a unique identifier called the ‘Message-ID’. When a large file is posted to a usenet newsgroup, it is usually divided into multiple messages (called segments or parts) each having its own Message-ID. An NZB-capable usenet client will read all needed Message-ID’s from the NZB file, download them and decode the messages back into a binary file.