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

Updated Aug 19, 2026

Reported In

Software

  • 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.
  • I installed TDM Excel Add-In for Microsoft Excel but when I open my TDMS file on excel I can see special characters.
  • 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.

Solution

Important: Installing the TDM Excel Add-In does not allow Microsoft Excel to open .tdms files directly through Excel's standard File → Open workflow.

 

The add-in works by importing TDMS data into a new Excel workbook. To view TDMS data in Excel:

  • Right-click the .tdms file and select Open with >> niskyline_exceladdinimporter

     
  • Open Excel and use Add-ins >> TDM Importer: Import a TDM(S) File. The importer will create a new workbook containing the data from the selected TDMS file.

     

 

If you are unable to import the TDMS file using either of the methods above, follow the troubleshooting steps below:

 

  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.