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AI Coding AssistantsAI Safety & AlignmentSimon Willison's WeblogPublished: Oct 15, 2026, 04:00 JST

Popcar: AI-powered decompilation is a game-preservation boom — and a risk to all software

Popcar: AI-powered decompilation is a game-preservation boom — and a risk to all software

3 Key Points

  1. What happened

    Indie developer Popcar describes a recent wave of AI-powered decompilation, enabling mashups between existing games and a boom in preservation projects that get old games running on new hardware, often in a browser via WebAssembly.

  2. Why it matters

    Popcar says the same capability applies to any software, so a paid game or app could be open-sourced against its owner's will and companies could steal from competitors, while old games become easier to port, modify and own.

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Context & Analysis

Popcar's piece frames the current moment as a two-sided shift in how software can be taken apart. On one side, AI-powered decompilation is feeding a boom in game-preservation projects that get old titles running on new hardware, often in a browser via WebAssembly, and enabling mashups between existing games.

The same capability, Popcar argues, is not limited to old video games. It applies to any software: anyone can decompile other software and use it any way they would like, which Popcar says means companies could steal from competitors and a paid game or app could be open-sourced against its owner's will.

Popcar also ties the preservation upside to a specific industry trend — console makers going all in on digital and games becoming unplayable when servers shut down — and argues this makes the ability to own software regardless of what the company thinks especially valuable.

FAQ
What is driving the new decompilation wave?
Popcar points to AI-powered decompilation of existing games, which is enabling mashups between games and a boom in game-preservation projects.
How are preserved games being made playable?
Old games are being gotten working on new hardware, often in a browser using WebAssembly.
Why is this scary for software companies?
Popcar says anyone can decompile other software and use it any way they like, so companies can steal from competitors and a paid game or app can be open-sourced against its owner's will.
Simon Willison's WeblogRead Original Article

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