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SPECIFICTION
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Fatpack

github.com

Windows
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Spec score 7.1 #21 of 28 in Executable Packers

Spec sheet

What it does
Fatpack is a Windows PE packer for x64 executables using LZMA compression and full TLS support.Read 7 Oct 2026 · github.com
Purpose
Fatpack is a Windows PE packer for x64 executables.Read 7 Oct 2026 · github.com
Intended users
The documented workflow is for users packaging a target executable with the Fatpack.exe command-line tool.Read 7 Oct 2026 · github.com
License
The repository provides the software under the MIT License.Read 7 Oct 2026 · github.com
Maker
The GitHub repository identifies its owner as Fatmike-GH.Read 7 Oct 2026 · github.com
Additional features
It supports icon extraction, relocations, imports, delay imports, exception handlers, memory section protection, and manifest extraction.Read 7 Oct 2026 · github.com
Compression
Fatpack compresses target executables with LZMA.Read 7 Oct 2026 · github.com
Executable support
It supports native console and Windows executables, but not .NET.Read 7 Oct 2026 · github.com
Known issue
The 1.5.2 release notes say packing may fail due to Windows Defender real-time protection interference.Read 7 Oct 2026 · github.com
Memory use
The README says section packing is preferred because it requires less memory at runtime.Read 7 Oct 2026 · github.com
Other capabilities
Listed technical features include relocations, imports, delay imports, exception handlers, memory section protection, and manifest extraction.Read 7 Oct 2026 · github.com
Packing modes
Resource packing is the default, while section packing is experimental and may cause issues with some targets.Read 7 Oct 2026 · github.com
Release assets
The releases page lists three assets for version 1.5.2.Read 7 Oct 2026 · github.com
Runtime requirements
Fatpack and its loader stubs use WinAPI without the CRT, so C/C++ redistributables are not required.Read 7 Oct 2026 · github.com
Section mode limitation
The README says section packing uses less memory at runtime but may cause issues with certain targets.Read 7 Oct 2026 · github.com
Supported targets
It supports native x64 console and Windows executables; .NET executables are not supported.Read 7 Oct 2026 · github.com
TLS
It supports TLS callbacks and TLS data, including executables such as Rust and Delphi programs.Read 7 Oct 2026 · github.com
TLS support
It supports Thread Local Storage, including TLS callbacks and TLS data.Read 7 Oct 2026 · github.com

Where Specifiction places it

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