Error message calling for newer version of MT Extra font when you use MathType tool in PowerPoint and in Word


When you use the MathType program, you receive an error message stating that a newer version of the MT Extra font is needed, because not all of the required characters are available.


This behavior can occur if all the following conditions are true:

  • You have MathType 4 installed on your computer.
  • After you installed MathType 4, you installed or used "Detect and Repair" in Microsoft Word or in Microsoft Office.
  • Your version of Office has the Equation Editor installed.
NOTE: Word and Microsoft PowerPoint are the two Office programs that are most likely to be affected by this issue.

MathType installs version 4.2 of Mtextra.ttf in the C:\Windows\Fonts folder. Both the Office Setup program and the Detect and Repair utility install version 3.1 Mtextra.ttf in the C:\Program Files\Common Files\Microsoft Shared\Equation folder, and then register that file as the current source of the MT Extra font.


To resolve this issue, follow these steps:

  1. Quit all Office programs.
  2. Reinstall MathType or run the MathType 4 Fonts Setup program.
  3. Start Windows Explorer and open the C:\Windows\Fonts folder.
  4. Click mtextra.ttf, and then click Copy on the Edit menu.
  5. Open the C:\Program Files\Common Files\Microsoft Shared\Equation folder, and then click Paste on the Edit menu.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

MathType 4 and MathType 4 Font Installer are available from Design Science, Inc.
For more information about hardware and software vendor contact information, visit the following Microsoft Web site:
When you run the MathType 4 Font Installer, you receive the following warning message:

These fonts may be overwritten when you install a word processor that includes Equation Editor (e.g., Microsoft Word, Corel WordPerfect, or AppleWorks). We recommend you run MathType 4 Fonts Setup after installing the word processor.
This is also true if you install or re-install any version of MathType earlier than version 4.
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.