This is two batch files, if you trust me sufficiently you can click see inside, export these two to your desktop, rename them from .txt to .bat, and then double check their names are "BrainF.bat" and "Boot.bat" respectively. Assuming they're both on your desktop or in the same folder you can now just run Boot.bat in administrator mode to setup the extension, once done if everything went according to plan you'll be able to create .BraF files! Just write a BrainF program into a .txt, change the file extension to .BraF, then double click it to run the BrainF program!