| Microsoft Office 2007/2010 Theme Format | |
| Microsoft | |
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File with a .THMX extension contains a theme template with a specified set of backgrounds, colours, fonts and formatting. It is available for documents created within Microsoft Office 2007 and newer software.
THMX files enable applying a theme to a different sort of documents, unlike templates from the previous versions of Office. They enable harmonising appearances of PowerPoint, Word, Excel or SharePoint documents. Office programs have the Themes Group panel, in the page layout section, that enables saving and loading of themes.
| .a2theme | Aston 2 Theme Format |
| .acb | Adobe Color Book Format |
| .acbl | Adobe Color Book Format |
| .aco | Adobe Photoshop Color Palette And Swatches Format |
| .acrobatsecuritysettings | Adobe Acrobat Security Settings Format |
| .acrodata | Adobe Acrobat Data Format |
| .acv | Adobe Photoshop Colour Curves Format |
| .acw | Microsoft Accessibility Wizard Format |