I have an third-party file with the extension .p and I try if it is possible to open it using the function
This returns 3, which is a file identifier according to the help function:
fopen - Open file, or obtain information about open files
This MATLAB function opens the file, filename, for binary read access, and returns an integer file identifier equal to or greater than 3.
What should I do to see (if possible) the content of the file?