...
var
F: TextFile;
begin
AssignFile(F, 'TextoPlano.txt');
Rewrite(F);
tabla.Open;
while (not tabla.EOF) do
begin
WriteLn(F, tabla.FieldByName('CAMPO1').AsString + ', '+ tabla.FieldByName('CAMPO2').AsString) + ...);
tabla.Next; end;
tabla.Close;
CloseFile(F);
end;