Add archived/electron-bundled-chromium-dll-fix

skills/archived/electron-bundled-chromium-dll-fix/SKILL.md

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+---
+name: electron-bundled-chromium-dll-fix
+description: Fix Electron app bundled Chromium failing to launch on Windows due to missing DLLs
+version: 1.0
+---
+
+# Fix: Bundled Chromium Missing DLLs on Windows
+
+## Problem
+Electron apps bundling Chromium (for CDP/browser automation) fail to launch on Windows. The process crashes silently with no error output. Root cause: GPU-related DLLs were removed to reduce installer size, but Chromium requires them even with `--disable-gpu`.
+
+## Missing DLLs
+These 3 DLLs must be present alongside `chrome.dll` in the bundled Chromium directory:
+- `D3DCompiler_47.dll` (~4.9MB)
+- `libEGL.dll` (~494KB)  
+- `libGLESv2.dll` (~8.2MB)
+
+## Source
+Download from Chromium for Windows release (e.g. `https://storage.googleapis.com/chromium-browser-snapshots/Win/<build>/chrome-win.zip`):
+1. Find build number from `chrome-win/` directory's `chrome_debug.log` or commit hash
+2. Download full zip, extract the 3 DLLs
+3. Copy to `resources/chromium/` in the Electron project
+
+## Key Insight
+**`--disable-gpu` is NOT sufficient.** Chromium still loads these DLLs at startup for basic rendering pipeline initialization. Without them, the process exits immediately with no stdout/stderr.
+
+## Fix Steps
+1. Download matching Chromium version full archive
+2. Copy 3 DLLs to bundled chromium directory
+3. Remove `--disable-gpu` flag from spawn args (optional — now GPU works properly)
+4. Add `diagnoseBrowserSearch()` function that checks: registry paths, known paths, DLL presence
+5. Rebuild installer: `npm run build:win`
+
+## Verification
+After build, check NSIS installer contains the DLLs:
+```bash
+7z l dist/atomk-desktop-X.X.X-setup.exe | grep -E "D3DCompiler|libEGL|libGLESv2"
+```
+
+## Context
+- Project: AtomK-Desktop (hermes-desktop fork)
+- Built with electron-builder, NSIS target
+- Bundled Chromium path in app: `resources/chromium/`
+- Browser search priority: System Edge/Chrome → Known paths → Bundled Chromium