Folder Security

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Hi, I have a folder on the server with a web sharing permission. if i add the Built-in security principals(Network) for sharing permission, i can use the scripting.fileobjectsystem to copy file from client to that folder. but the problem that i can access that folder from client. when i remove this permission then i cannot access the folder from client but also i cannot copy file using scripting object.(access denied exception) Any idea ?? Regards

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