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Office Settings & Configuration

Excel Add-In vs THMX vs XLTX: Choosing the Right Format for Custom Themes

WPS Content ManagerWPS Content Manager Sep 29, 2026 869 views

Question details

The user needs to understand the differences between .xlam, .thmx, and .xltx file formats to determine the best method for distributing custom themes and automation in spreadsheets.

Excel Add-In vs THMX vs XLTX for Custom Themes
Product
Microsoft Excel
Device & OS
not provided
Scenario
Distributing custom visual themes, structured layouts, or automated features to multiple users.
Observed behavior
Choosing the correct file format based on distinct requirements such as standalone styling, predefined layout templates, or programmable ribbon commands.
Before you start

Identify whether you only need to share visual formatting, a pre-designed spreadsheet layout, or complex automated macros, as your specific goal determines the correct file type to use.

Solution 1

Use a .thmx File for Standalone Themes

Best for sharing just the colors, fonts, and graphical effects without enforcing any specific cell layout or data.

A .thmx file is specifically designed to house Office themes. This is the optimal choice when you want users to apply standard corporate branding or visual styles to their existing, uniquely structured workbooks.

1
Identify theme requirements

Determine if your goal is solely to standardize visual elements across documents without altering the underlying data structure.

2
Deploy the theme file

Distribute the .thmx file to your users. They can apply it by navigating to the Page Layout tab, clicking on Themes, and selecting 'Browse for Themes' to apply the custom styling.

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Frequently Asked Questions

Can an Excel add-in automatically apply a theme to my workbook?

Yes, an .xlam add-in can apply a visual theme to existing workbooks, but it must be explicitly programmed with VBA or macros to trigger the theme application when a specific ribbon button is clicked or a workbook is opened.

When should I choose a .thmx file over an .xltx template?

Choose a .thmx file when you only need to distribute custom fonts, colors, and visual effects to be applied to a user's existing data. Use an .xltx template when you need to provide an entirely new workbook structure with predefined cells, text, and formulas alongside the visual design.

Are .xltx template files compatible with WPS Office?

Yes, WPS Spreadsheet offers excellent compatibility with Microsoft Office file formats. You can seamlessly open, edit, utilize, and save .xltx template files within WPS Office.