It is not clear what RoadRunner is or what it does.
If you don't have a valid (current) MATLAB license, then you cannot "use" an m-file. However, an m-file that you have personally written is just a text file. You can still edit or view it in any text editor. Just make sure it gets saved properly. You can even use at least some of them in other softwares like Octave, that are at least partially compatible with MATLAB.
Can you open, edit, use other files? Generally not. You will not be able to open or view a .mat file, or some other file types, perhaps coming from Simulink, etc. If you have saved your data in a flat text file, then yes, it will be accessible to you.
