@WP, it is an interesting solution, since i do not have any spetial requirement for that file, just only to make easy the life of the user. I had on mind an INI file, since i do not want to allow to modify ALL the options, but titles, foot fonts properties, and visibility, series properties,..., I know they are still many.
In any case, about your solution, it seems it only works with the chart design, but not with the data series, right?
If i open the program, save the chart, and open the file, the result is perfect. However, once i create the file storing the chart style, if i close the program and open it again, when loading the chart, the new plot show the right design, but without the series... i suposse that i must also connect the chart with the original data file/s, populate a chartsource component,...