Hello, I recently used TDMS files in a customer application and for that purpose I made VIs to write/read clusters containing parameters to/from TDMS file. These VIs are basically *copies* of the Read Variant Key.vi and Write Variant Key.vi from the OpenG Variant Configuration File palette so I thought it would be a good idea to add it to OpenG. Hopefully it could help someone. PS: haven't tested these VIs extensively (with all possible data types in LabVIEW) but they do work fine with big c