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Why does the last modified date for grid and info folders update when added to TOC or previewed in Catalog?
The last modified date of the grid folder and its associated info folder are updated when the grid is added to ArcMap as a layer, or when displayed in ArcCatalog’s preview mode. The actual data file's dates inside the grid name and info folders remain unchanged. To view a grid’s correct last modified date, query the individual files inside the folder.