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Using Visual COBOL, a program that opens an indexed file for OUTPUT creates just one file on disk, as opposed to the behavior in earlier versions of MF COBOL, where two disk files were created: a data file and an .idx file.
In Visual COBOL, the default IDXFORMAT is now IDX8, which creates just one disk file holding both the data and the index. To override this default behavior and configure Visual COBOL to create IDX4 files instead, a person can specify idxformat=4 in the File Handler Configuration file, or use the IDXFORMAT"4" compiler directive, or specify $set idxformat"4" in source code.