This is a Microsoft wired Comfort Curve 2000, with Spanish layoutĪt first I had assumed I could have changed my layout, however: In my keyboard layout (es-ES), this is achieved pressing AltGr + `.
The specific key combination for the key [ is not working on my system (Win 10 Pro 圆4). I'm baffled here (after 20+ years working on IT), and don't know what to do next. I don't know if this is the right community to ask in, but I've seen several 'plausibly' equal questions.