Hi @Wim_van_Uden welcome to Zwift forums.
The N edition of Windows strips out Media Player and other multimedia features built in to other versions of Windows. This might be why you’re seeing an error message about missing DLL files.
You can tell which edition / license is installed using this Microsoft support page.
Once you know which Windows update version is installed, try installing the right Media Feature Pack. The one for Win10 Update 1607 is here, and other update versions of Windows 10 and 11 are here.
Would you try those steps and tell us if that solved your issue? It may help others in the future with similar symptoms.