Cannot Open TDMS Files in Office 365™ Excel With TDM Excel Add-in

Updated May 14, 2024

Reported In


  • LabVIEW
  • LabWindows/CVI
  • TDM Excel Add-In for Microsoft Excel

Issue Details

  • I have installed the TDM Excel Add-In from the NI website. However, I am unable to open TDMS files in Office 365™ Excel (desktop version). When I open a file, something flashes but the file does not open.
  • Previously, I have been successfully using TDMS files generated by LabWindows™/CVI TDMS functions.  My issue is with files created using the DAQmxConfigureLogging (…) function. These files can’t be properly understood by the TDM add-in.


  1. Check if the TDM icons are present within the Add-ins tab in Excel. The icons look like the following:
  1. If you don't see these icons, you must first install and activate this add-in so that you can use them. To activate a TDM Excel Add-in:                                                                                                              
1. Click File tab, click Options, and then click the Add-ins category.                                                 
2. In the Manage box, select COM Add-ins from the dropdown menu, and then click Go.  The Add-ins dialog box appears.   
3. In the Add-ins available box, select the check box next to the TDM add-in and then click OK.
4. If you can't find the TDM add-in in the Add-ins box, you may need to install it.      
      3. If you see these icons and still cannot read TDMS files correctly, re-install the TDM Excel Add-in.
          1. Uninstall the TDM Excel Add-in.
          2. Install it again.