Files that contain the .nzb file extension are used by the Newzbin indexing service. Newzbin indexes the contents of a Usenet posting, such as the poster name, posting groups, file names and unique ID.
An NZB file can be used to gather the contents of a news feed from a Usenet posting. The NZB file will do this by downloading headers that are specific to a user's search criteria rather than downloading all of the headers in a particular newsgroup.
NZB files are saved in the XML file format. This allows users to save bandwidth and time since the entire newsgroup list does not have to be updated while the files are being downloaded onto the user's computer.
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File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.
If you have additional information about the NZB file format or software that uses files with the NZB suffix, please do get in touch - we would love hearing from you.