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This patch addresses the issue of certain ArcGIS applications showing a Runtime Error R6034 message. Certain ArcGIS 10.4 applications show a Runtime Error R6034 message. This error may come from ArcCatalog.exe, ArcReader.exe, DesktopIndexingService.exe, or MXDDoctor.exe. It occurs most frequently when opening the Search window in ArcCatalog or when DesktopIndexingService begins to index folders in the background.