Types of THMX Files

Main THMX Affiliation

.THMX

File Name:	.thmx
Classification:	Microsoft Office 2007 Theme File

A THMX file is a theme file that can be applied to a document or presentation created with Microsoft Office 2007 or later versions. It is typically used as a template for creating multiple files with a similar look and feel in Word, Excel, and PowerPoint.

Author:	Microsoft Corporation
Function:	Settings Files
Subkey:	HKEY_CLASSES_ROOT\.thmx

Software Programs That Open The Microsoft Office 2007 Theme File:

Microsoft Excel by Microsoft Corporation

Windows

	Mac
	iOS

Android

Microsoft PowerPoint by Microsoft Corporation

Windows

	Mac
	iOS

Android

Microsoft Office by Microsoft Corporation

Windows

Mac

Microsoft SharePoint by Microsoft Corporation

	Windows Server 2008 R2
	Windows Server 2012

Microsoft Word 2016 by Microsoft Corporation

Windows

Mac

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Troubleshooting Problems Opening THMX Files

Common Problems Opening THMX Files

Microsoft Excel Not Present

If you attempt to load your THMX file, you experience a message such as "Can't Open THMX Files". Customarily, this means that Microsoft Excel is not installed on %%os%%. The typical path of opening your THMX with a double-click won't work because %%os%% cannot make the program connection.

Tip: If you know of another program that can open your THMX file, you can try opening it by selecting the application from the programs listed.

Wrong Version of Microsoft Excel is Installed

In some cases, you might have a newer (or older) version of a Microsoft Office 2007 Theme File file that is unsupported by your installed application version. Visit the Microsoft Corporation website to download (or purchase) the latest version of Microsoft Excel. This issue mainly occurs when your Microsoft Office 2007 Theme File file was created by a newer version of Microsoft Excel than you have on your PC.

Tip: You can sometimes get hints about the right program version by right-clicking on the THMX file, selecting "Properties", and looking at the version information.

Conclusion: The majority of THMX file opening issues are due to not having the correct Microsoft Excel version installed.

Other THMX File Opening Causes

Even with the correct version of Microsoft Excel installed, you can still experience difficulties opening THMXs. If you are continuing to have errors with loading THMX files, other external issues might be to blame. Problems unrelated to software:

• THMX file references in the Windows Registry are broken
• Unintentional removal of the description of the THMX file inside the Windows Registry
• Microsoft Excel or another THMX application experienced a flawed installation
• Something has caused file corruption of your THMX
• Your THMX has adversely impacted by malware
• Hardware related to THMXs has device driver corruption
• Windows cannot load your Microsoft Office 2007 Theme File file due to insufficient resources (eg. RAM)