Understanding WSA Build Numbers

2026-02-22·3 min read

#wsa#builds#reference

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Anatomy of a Build String

Take the final build: 2407.40000.4.0. The first part (2407) is the year/month it was compiled (2024-07). The middle (40000.4.0) is the Android platform/framework version it maps to. WSA Installer defaults to 2407.40000.4.0 because it is the last and most compatible release.

Why the Build Matters

Newer builds = better app compatibility and security fixes
The final 2407 build supports the widest range of modern APKs
Older builds may fail to launch newer apps or Play Services

WSA Installer auto-selects the 2407.40000.4.0 build so you don't have to track version strings yourself.

Community Builds

Projects like WSABuilds republish Microsoft's builds with optional GApps/NoGApps variants. WSA Installer can consume these directly, including the offline bundle.wsa for air-gapped installs.

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#wsa#android#windows

2026-03-12 · 5 min read

What Is Windows Subsystem for Android (WSA)?

A plain-language introduction to WSA: what it is, why Microsoft built it, and how it lets you run Android apps on Windows 11.

#wsa#architecture#android

2026-03-15 · 8 min read

How Windows Subsystem for Android Actually Works

A technical walkthrough of the WSA stack: the AOSP runtime, the libhoudini/llvmpipe translation layer, init, and how Android apps become Windows windows.

#wsa#wsl#comparison

2026-03-18 · 4 min read

WSA vs WSL: What's the Difference?

Both are 'Windows Subsystem for…' projects, but they serve very different runtimes. Here's how WSA and WSL compare.

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