NUL device is suddenly broken after Win10 update.

Dave Lovelace 1 Reputation point

After upgrade to Win10 version 22H2, the NUL device suddenly is not working any more. I have many programs that do this to avoid the user's seeing File Not Found errors etc. The error is "Access is denied". This happens even when I'm admin. What did Microsoft do this time? How do I fix it?

A simple example is something like "DIR > NUL". This has always worked before; now I get "Access is denied". I've googled and found many, many postings four years ago and more. Nothing about my specific problem, though.

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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  1. Reza-Ameri 16,861 Reputation points

    In this case, I advise you to open start and search for feedback and open the Feedback Hub app and report this issue.
    Meanwhile, you may rollback to preview build.
    You may open Settings->Update & Security->Recovery and go back to previous build.
    Note that you have up to 10 days after installing new build to do rollback.

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