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WiX's candle.exe/light.exe are 32-bit. On a SYSTEM-run runner Tauri caches WiX under C:\Windows\system32\config\systemprofile\..., and WOW64 redirection sends 32-bit processes to SysWOW64 where that directory does not exist, so candle exits 0x80131700. Tauri aborts the whole bundle on one target's failure, so the MSI was suppressing the NSIS installer too and Windows produced no artifact at all. NSIS is what the project already relies on for Windows upgrades. Drops the .NET 3.5 gate, which existed only for WiX; keeps the MSVC step, which is what makes the app link. Artifact collection now fails when no installer is produced rather than tolerating an empty directory. To restore the MSI, run the runner as a normal user and set --bundles msi,nsis. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>