When using a PC with a second display (for example a laptop with a data projector) it is often a common problem to find that a video played with Windows Media Player will only display on the primary display, and not on the secondary output.
There are various different configurations which contribute to this behaviour — Windows settings, Windows Media Player settings and Graphics Card driver settings.
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“Hi James I realise it has been a long while, but I just checked this on windows 11 (build 23H2)…”