Hi mate I am not sure if you have fixed the issue already but I had the same problem and I found a fix for myself so I thought I might share it with you regardless.
When I first installed Anno 1800 I got the message saying that I do not have mfreadwrite.dll.
DO NOT DOWNLOAD THIS DLL SEPARATELY
Download Windows Media Features from the internet according to your Windows version and install it.
Mine was Windows Pro N version 20H2, (The latest update so far) and I cannot download it from the web as there is no Windows Media Features available for download for that particular windows version.
If this is the case for you as well, go to:
Settings > Apps > Apps and Features > Optional Features > Add a Feature and find the Media Feature Pack in the list of available Optional Features and do a reboot.
This fixed the issue for me and I hope it does the same for you if you have not fixed it yet.
When I first installed Anno 1800 I got the message saying that I do not have mfreadwrite.dll.
DO NOT DOWNLOAD THIS DLL SEPARATELY
Download Windows Media Features from the internet according to your Windows version and install it.
Mine was Windows Pro N version 20H2, (The latest update so far) and I cannot download it from the web as there is no Windows Media Features available for download for that particular windows version.
If this is the case for you as well, go to:
Settings > Apps > Apps and Features > Optional Features > Add a Feature and find the Media Feature Pack in the list of available Optional Features and do a reboot.
This fixed the issue for me and I hope it does the same for you if you have not fixed it yet.