What are chart templates? to reuse a chart that you customize to meet your needs, you can save that chart as a chart template. You can apply this template when you create a new chart, or you can change the chart type of an existing chart using the template templates are stored with the extension dot c rt x in the default charts, template folder, C, colon backslash users backslash user name, backslash App Data backslash, roaming, backslash. Microsoft backslash templates backslash charts