.mat is not a format, it's actually just MATLAB's binary storage of workspace variables along with some metadata. What you actually need is loading your data in MATLAB workspace in order to be accessibile ti your scripts, in other words you firstly need MATLAB to 'understand' your data. The most straightforward way seems to be the one outlined in https://www.chromforum.org/viewtopic.php?t=20829
If you have this data in Shimadzu Labsolution (which uses .lcd-Files) you can convert your data with this software into NetCDF format (also called ANDI-format) which is a text encoded file which can easily transfered to MATLAB .....