Thanks for your help.
Sorry. My problem was not about .csv/.tdms.
Because I want to place data into particular Cells in Excel ( Cell values will change at Runtime).
For your Information my Report will not exceed more than 60,000 rows so, no need to Split the File.
So, I want to know, why LabVIEW is losing ActiveX Reference when we are doing Excel Open/Close at Runtime.
Because I’m not deleting this file(just Closing). I think it should not loose.
BR,
Munna