Windows users have a trouble saving plain TXT files without extensions on a Windows machine. For example, if you have to edit C:\Windows\System32\Drivers\Etc\hosts file and save as a plain text file, Windows will automatically add .txt file extension to the file and save it as hosts.txt. Also, Windows does not allow you to edit the file directly in the system folder such as the C:\Windows\System32\Drivers\Etc.
To get around this problem, you'll first have to change folder options of your Windows machine. To do this, please follow the instruction below.