As I was going through my art files I noticed none the files inside the folder were marked with Read-Only but when I looked at the art folder's properties it was fully blackened. It doesn't make sense.
Oh ... that's different.
For a file, read-only truly means read-only. The read-only attribute for a folder is different. After all, you can rename or even delete a folder that is marked read-only, which you could not do if it was really 'read-only.'
The read-only attribute for a folder is like a toggle - used to indicate that the folder has special features, like the customizable appearance of Documents, Music, Pictures and Videos, or the special treatment given to the Fonts folder. (Those are fonts
in there, not just lines of text.)
That's why your folder of art files is marked read-only, even though none of the files themselves are read-only. Folders of photos can take on a customized appearance, if you choose, that they inherit from the top-level Pictures folder.
It's explained in more technical language by Microsoft here: You cannot view or change the Read-only
or the System attributes of folders ... That article was written for Windows Server 2003, Windows XP, Windows Vista and Windows 7, but it still applies in Windows 10. Here's an excerpt:
"Unlike the Read-only attribute for a file, the Read-only attribute for a folder is typically ignored by Windows, Windows components and accessories, and other programs. For example, you can delete, rename, and change a folder with the Read-only attribute
by using Windows Explorer.
The Read-only and System attributes is only used by Windows Explorer to determine whether the folder is a special folder, such as a system folder that has its view customized by Windows (for example, My Documents, Favorites, Fonts, Downloaded Program Files),
or a folder that you customized by using the Customize tab of the folder's Properties dialog box."
So, once again, there is no 'problem' here that needs to be solved.
I don't play games and don't know how the SIMs work so, sorry, I can't help you with that.