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If the requested file data could not be retrieved or the sender received an unsuccessful Format List Response PDU (section 3.1.5.2.4), then the clipHeader field MUST contain the CB_RESPONSE_FAIL (0x0002) flag and the requestedFileContentsData field MUST contain no data (zero-length). https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpeclip/5d3991e9-440d-4e4d-8b8d-391c324c4007 Fixes #1997.