extract-android-assemblies

name	extract-android-assemblies
description	Locally extract managed DLL files from .NET for Android APK, AAB, assembly-store, or compressed DLL inputs, including legacy/current store layouts and LZ4/Zstd compression. Use when investigating a customer Android package, getting assemblies for ILSpy or decompilation, unpacking assembly stores, or recovering ABI-specific managed files.

Extract Android Assemblies

Extract customer assemblies locally with the bundled C# file-based app. Never upload the input package or extracted code.

Workflow

1. Resolve the input file and choose a new output directory. Keep temporary customer artifacts outside the repository.

2. From the repository root, run:

   dotnet run --file .github/skills/extract-android-assemblies/scripts/extract-android-assemblies.cs -- --output <output-directory> <input.apk-or-aab>
   

3. Pass multiple input files after the output option when needed.

4. Do not reuse a non-empty output directory: the app refuses to overwrite files.

5. Report:

   • detected inputs
   • extracted DLL count grouped by ABI
   • whether LZ4 or Zstd decompression occurred
   • the local output directory
   • unsupported or corrupt store details

The app supports:

• legacy assemblies/assemblies.blob store sets and manifests
• historical libassemblies.{abi}.blob.so stores
• current libassembly-store.so stores
• individual legacy and RID-specific packaged assemblies
• raw, ELF payload, and _assembly_store symbol wrappers
• uncompressed, XALZ/LZ4, and XAZS/Zstd assembly data