Unable to find an entry point named 'SiOpenWinInitEx' in DLL 'siappdll'.

This error message appears in Mecway 13.0 if you have a 3Dconnexion controller with an old driver. The solution is to update the driver from here https://www.3dconnexion.com/service/drivers.html

Sorry to keep you on the update treadmill.

Alternatively, you can disable the controller in Mecway through Tools -> Options -> 3Dconnexion -> Enable controller (requires restart).
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