Ownership of a file

Depends too on which files they are and where they are located.

Examples please?

which I transferred to the Pictures folder

That can happen when bringing files in from 'outside' such as downloads, E-Mail attachments, cameras, etc.

Booms said:

A quick example is a photo I took of my dogs, which I transferred to the Pictures folder on my PC.
When I try to open it, I get the message (see attachment).

Ah, that's PaintShop Pro you are using. It's probably not ownership or permissions, it's much more likely that PSP as a 3rd-party app is being blocked by Controlled Folder Access.

Add your PSP as an allowed app and you should have access.

Add or Remove Allowed Apps for Controlled Folder Access in Windows 10

I had to add my PSP, along with a number of other 3rd-party apps such as LibreOffice.

I assume you would have said if there were any errors during login.

If this problem applies to all your files then wonder if you are logged in normally.

1 You can check what you are logged in as by running this command
- in a cmd window

Code:

echo %UserName%

- or in a PS window

Code:

$env:UserName

2 And take a look in C:\Users.
- Anything unusual there?
- Is a folder matching your UserName shown?
- Is a folder called Temp shown? Fix You've been signed in with a temporary profile - TenForumsTutorials

By the way, it is generally both risky & unnecessary to keep the Built-in Admin account enabled [the one with the UserName Administrator, as illustrated in your diagram].
If you want to keep a spare account or two for emergencies, such as user account corruption, make one or two of your own - Create two spare local, password-protected Admin accounts [post #2] in Windows 10, 11 - TenForums
If you take this precaution you will never need to enable the Built-in Admin account again.
... Disable Built-in Elevated Administrator Account - TenForumsTutorials



All the best,
Denis

I'm glad it's fixed.
You do realise that the built-in Defender is good?

Denis

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