If you have a file in Windows, you have the option of changing the name of the file. So you would take a file that is called thisisatest.php, for example, and rename it to thisisatest.bin.

Alternately, you could take a file and save it as any name you like.

These are basic Windows functions.

Once you have renamed the file to somethingorother.bin, you could proceed with the installation instructions.