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When a table for a tab delimited text file is opened in ArcMap or ArcCatalog, the data is not correctly entered into columns.
ArcMap and ArcCatalog interpret files with a .txt, .csv, or .asc extension as comma delimited by default. Files that have a .tab extension are interpreted as tab delimited by default.
Select an option below.
For more information on modifying the schema.ini see Accessing delimited text file data