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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Ahh - so @skm it's possible it was a Linux issue. I wonder whether the OS-provided file chooser fails to run if there's no 'description' for the file format (which ended up being the problem - according to the docs it's supposed to be optional). My Laptop may have worked because it used a different Linux distro.
It seemed like an odd problem as usually the web browser would give a better, more targeted error when something like that happens