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Here's how to Fix The Access Control List (ACL) structure is invalid on Windows.

i. The Access Control List (ACL) is the structure Windows uses to manage permissions and access controls for resources. Here are some key things to know about ACLs in Windows:

- Contains Access Control Entries (ACEs) - The ACL contains a list of ACEs which each define access rules for specific users/groups.

- Defines access rights - The standard access rights that can be allowed or denied in an ACE include things like read, write, execute, delete etc.

- Applies to objects - ACLs are attached to objects like files, folders, registry keys, processes to control access.

- Allows and denies - ACEs can allow or explicitly deny access rights to an object for a user or group.

- Inheritable - ACLs applied to a parent (folder) by default apply to all child objects (files).

- Order matters - The order of ACEs in an ACL matters. Earlier deny entries override later allows.

- Complex structure - ACLs can contain many ACEs with overlapping permissions making them complex to interpret.

- Viewable - You can view the ACLs on an object using utilities like ICACLS or via Properties - Security tab.

- Modifiable - Administrators can modify the ACL to add/remove users and rights by editing the object's permissions.

So in summary, ACLs are the core structure controlling who can access resources in Windows and what actions they can/cannot perform.