TDMS minimum property

What forces TDMS Minimum and Maximum properties to be calculated?

I generate a TDMS file, open it with TDMS viewer or Excel toolkit, the Minimum and Maximum Values are empty.

If I convert it to TDM file and open, the values are calculated.

If I attempt to "Set" the Values, I get Error -2526 "Cannot write to this value"

Where may I find a list of NI TDMS properties?

Thank you, Jeff