Solution
Please note that this solution will not work in Office 365 versions, this applies to Excel 2016 or earlier versions only.
To solve this issue, follow the steps below:
- Uninstall the TDM Excel Add-In following the steps here: Uninstall TDMS Excel Add-In
- Download the TDM Excel Add-In here again: TDM Excel Add-In for Microsoft Excel Download.
- Follow the installation instructions. The TDM Excel Add-in should be listed as new software that will be installed.
- After installing the TDM Add-in, open Excel and check in the Add-ins section if the TDM Add-in shows up.
- In case the TDM Add-in still does not show up in Excel, go to: File > Options > Add-Ins.
- The National Instruments TDM Importer for MS Excel should show up in the list.
- At the bottom, next to Manage, choose "COM-Add-ins" and press OK.
- A small window will pop up. Check the box left of the "National Instrument TDM importer for MS Excel" and click on "OK".
- Try re-opening Excel and using the add-in to import a TDMS file.