How to add atlas in DPABI_VIEW?

I am trying to locate the position of some brain structures in DPABI_VIEW with the atlas provided.

However, existing atlas can only show rough structures while I want the position of some fine structures.

I tried to find some atlas on the internet whose file format are ".nii", but DPABI_VIEW needs both ".nii" file and ".mat" file to successfully add an atlas.

I wonder how I can succefully add an atlas to DPABI_VIEW and if there is any recommended website for me to easily find suitable atlas and corresponding “.mat" file.