I have calculated a variable called FNET. I have saved FNET to the hard drive using the following command: save(fullfile(BasePath,'FNET'),'FNET','-mat') BasePath is a string that gets the file to the correct directory on my hard drive. First Question: FNET shows up in the correct place, but in Windows Explorer the file type is shown as "File" rather than (what I would expect) MATLAB M-file. Why? Second Question: I've written a program that needs to load this variable. None of the following commands have worked: load FNET load fullfile(BasePath,'FNET.mat') and various other attempts. Please help!