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TechNote #70: Last modified: 10/10/99
Last reviewed: 11/08/00

CTL3DV2.DLL Error while Installing MathType 3.5 in Windows NT 

The information in this document applies to:

MathType 3.5x (Win NT 3.x, 4.x)


While installing MathType, I receive an error message indicating that the CTL3DV2.DLL could not be installed.  The installation then abruptly ends.


While we are unsure as to why exactly this error occurs, we have found that the error message is associated with having multiple copies of the CTL3DV2.dll file on the computer.  Only one copy of this file is needed, and somehow, more than one interferes with the installation process. 


Find and rename all extraneous copies of the CTL3DV2.dll file.

  1. Close all running applications.
  2. Open the Windows Explorer (Start|Programs|Windows Explorer)
  3. Right mouse click on the drive that contains your Windows NT directory; this will produce a popup menu.
  4. Select Find... from the menu; this will display a dialog in which you can do a search.
  5. In the Filename field, type "ctl3dv2.dll" (without the quotes).
  6. Make sure that the option to "Include subfolders" is checked.
  7. Press Find Now.

Depending on your situation, you may have one or more files with this file name located on your system.  Once the search is complete and is displaying the list of files that it has located, rename each file (to be on the safe side).  If you have multiple copies of the file, name them CTL3DV2-1.DLL, CTL3DV2-2.DLL, etc..  Once you have renamed all the matching files, rerun the MathType installer, which will install and register properly the CTL3DV2.DLL file into your System32 folder.

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