And found two more letters
https://en.wikipedia.org/wiki/File_attribute
Zitat:
Not Content-Indexed (I): When set, Indexing Service or Windows Search do not include the hosting file in their indexing operation.
Reparse Point (L): The file or directory has an associated re-parse point, or is a symbolic link.
Offline (O): The file data is physically moved to offline storage (Remote Storage).
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Sparse (P): The file is a sparse file, i.e., its contents are partially empty and non-contiguous.
I and L can be seen with link files like the directory "Cookies" in your user directory.