Note: Subfolders don't have that icon.
Problem came back today when I was sorting some files, trying to rename, copy, ... And windows wouldn't let me saying I need administrative rights! I couldn't even open the file normally in Subtitle workshop, saying it cannot be accessed. With help of Unlocker I moved the file to desktop and it worked normally there. So that mess I did weeks ago is to blame lots of files on My Book don't work as they should. So how can I fully repair this condition, clearly having something to do with accounts and administrative rights and stuff like that.