Here is the link how to solve the problem.
This solve the problem accessing nucleus from windows 11 pc.
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Thanks for this. I posted a link to this in Feedback
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Well that did it even if I do not have a NAS. I would have never figured that out. Thank you.
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Brilliant. Thanks - sorted for me.
Does not work for me. Roon server is completely hidden on my windows 11 computer. It has become extremely frustrating; it is as if it doesn’t exist.
Well it worked in November but now, as of April 2025, Roon has disappeared and none of these suggestion help. Really frustrating.
If you need help with this, you should open a new topic by clicking here → Support and then Get Help.
Most likely, you just have to do this:
And in case it then shows you a window to enter username/password, the instructions from above in this thread should help.
He has already done that:
Oh OK, then he is in your capable hands 
Though in the other thread it’s not clear if he tried entering \\NUCLEUS\Data\Storage\InternalStorage into the File Explorer’s address bar
I made the mistake of adding the \nucleus\data\storage\internalstorage in the search bar rather than the address bar. I tried the address bar instead and all worked. Never would have guessed that would have been the answer. Thanks for the help.
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Great! Unfortunately, through a combination of Windows and Roon OS behaviors, the Nucleus isn’t always automatically shown under Network in the File Explorer, so it may be necessary to tell it the full address like you did.
To avoid this, you can map the address to a drive letter. Then it will always be accessible under Drives in the Explorer. See How do I map a network drive on this help page: