neilharvey FileSignatures by: neilharvey .NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher. 3,101,008 total downloads last updated 5/21/2025 Latest version: 5.2.0 File Format Mime Type Media Type Header Signature Detection A small library for detecting the type of a file based on header signature (also known as magic number) rather than file extension.