Hi so heres how read only works on windows.
When you right click and go to properties that box next to read only is what im talking about.
First off Read Only isnt set on folders its set on files that option isnt what you think.
Second It doesnt tell you if its read only or not on that check box.
Treat it as a GUI for applying or removing Read Only.
Filled box=(Nothing to be done). Check in the box means apply read only blank box means remove Read Only. That being said CAS error sucks and i have it to!
EDIT: This is for windows for the record!