Fatpack

What Fatpack is

Fatpack is a Windows tool for packing 64-bit Windows PE executables. It compresses native x64 console and Windows programs with LZMA and supports Thread Local Storage data and callbacks, including for Rust and Delphi programs. .NET executables are not supported. Resource packing is the default; section packing is experimental and can cause issues with some targets, though the README says it uses less memory at runtime. Other documented functions include relocations, imports and delay imports, exception handlers, memory section protection, manifest extraction, and icon extraction. Fatpack and its loader stubs use WinAPI without the C runtime, so C/C++ redistributables are not required. The documented workflow uses the Fatpack.exe command-line tool to package a target executable. The project is available under the MIT License and is free. Its 1.5.2 release notes say packing may fail when Windows Defender real-time protection interferes, and the releases page lists three assets for that version.