You can directly write this problem to Jörn M. Horschig who is the software developer of Artinis fNIRS systems.

But, if you have the data, may be you can save it in a different format. As far as, I remember Artinis allows you to do this.

Dear Zilu Liang,

I think you will find your answer in this blog post.

www.artinis.com/blogpost-all/2021/fnirs-analysis-toolbox-series-mne-python

Kind regards