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In the Delphi Help.pdf it states that if I use the IndexDefs property to create an index on a TClientDataSet it will persist and be saved to the client dataset file.

But, I've tried all I can and it isn't saved. BTW, I create the IndexDef before I call CreateDataSet and am using SaveToFile. No provider.

Code to create the index:

with cdsTemp.IndexDefs.AddIndexDef do begin
Name := 'Primary';
Fields := cdsTemp.Fields[0].Name;
Options := [ixPrimary];
end;