[llornkcor]

> Qt clearly deserves the credit for having a WASM runtime that gets us a working GUI toolkit.

You're welcome. :) What version of Qt did you use for this demo? Also, for local system file access dialog on Qt wasm, you can use https://doc.qt.io/qt-6/qfiledialog.html#getOpenFileContent

[llornkcor]

Answered my own question by reading the README.wasm.md "We're using Qt 5.15.2 with Emscripten 2.0.31. "