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In Microsoft's Scripting Runtime Library, the Attributes property of the File object has a bug. If you set a read or write attribute (e.g., ReadOnly, System) for a compressed file, you get an error. Microsoft knows about the problem.

Fortunately, you can work around this problem until Microsoft fixes this bug in a future Scripting Runtime Library release. You can use the WshShell::Run method of the Windows Scripting Host (WSH) to launch a Windows NT command shell so that you can use NT's Attrib command to change the file's attribute. Although this solution isn't elegant, it works.

—Thomas S. Holt
tholt@alleghenypower.com