You should be able to right click on the file and then go to Open with > to select Notepad.

I only suggested to do this as a way to verify that the batch file just has the one command steemd.exe --replay in it because some may be concerned about download a batch file without checking it out first.

Anyone can create their own batch file by just make a text doc with the one line of code in it and then renaming it to a .bat extension. But they will need extensions turned on Windows Explorer settings (it's off by default).