[Solved] Excel Error: The file format and the extension of .xls dont match

I am trying to maintain simple log file on button click on form.

I am able to do perfectly but there is one error when opening log excel file.

Its is saying that "The file format and the extension of .xls don't match."

My issue is only the error message which i am getting when try to open that excel file

I am opening it in office 2016