At the very least you need to use an editor program to edit a file, such as the old MS-DOS edit. Of course if you're using windows 8 I believe they took out those old command line tools. Just google editors for DOS or Windows Command Line and you'll find something. You will of course also need a compiler such as the GNU compiler and there is a bit more work to get it to run in Windows. If you want something simple and just for fun you could always hitup the old Borland software
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/edn.embarcadero.com/museum/