Hi, Svrsokol
Welcome to Microsoft Community.
We understand that you have encountered problems when opening DLNA on Windows 10 Server 2019, and I fully understand your feelings!
Please allow me to explain that our current Microsoft community focuses on solving problems in daily use of Windows, such as the disappearance of mouse pointer, the failure of WiFi connection, and the failure to install Windows updates.
I really hope I can handle your problem, but it needs to be explained that the problems related to Windows 10 Server 2019 are beyond the support of the Microsoft community, and it has corresponding forums (Microsoft Learn) and corresponding sections, as well as corresponding experts, who can provide you with more focused and professional suggestions.
Since the current problem is beyond the support of the Microsoft community, according to the requirements of the community rules, I will guide you to the correct forum to post the problem. You can click the link below and then click "Ask a question" at the top of the page (as shown below).
We hope that your problem can be properly handled after contacting the correct department. Thank you for your understanding!
Best Regards
Nicholas.Z - MSFT | Microsoft Community Support Specialist