batch files are simply text files, so all you need to create one
is the Windows notepad application. Don't use WordPad or a word processor
like Microsoft Word; these do not produce 'pure' text files by default,
since they add their own text formatting.
To create a simple batch file, all you need is a single command you want to
run, typed into a text file and saved with the .BAT extension, like
'mybatchfile.bat'. Double click this file and it will run your command.