A CRTX file contains a chart template that can be applied to multiple documents and presentations in Microsoft Office 2007 or later. It stores settings for colors, axes, gridlines, categories, legends, text, title, and other chart options. CRTX files are used to apply the same styles and formatting to multiple charts.

To save a chart template, select an existing chart and choose the "Save as Template" option from the "Design" tab. Chart templates should be saved in the Charts folder. To apply an existing chart template, select the target chart and choose the "Change Chart Type" option within the "Design" tab. To manage chart templates imported in the Office program, follow these instructions: Select the "Insert" tab and click the "Insert Column or Bar Chart" icon. Select More Column Charts.... Select "Templates" from the left pane, and click Manage Templates....