CentOS 7 Share a file on my network so anyone can download it

There are two possible packages to use -- httpd, or nginx. Both are provided by CentOS 7.

httpd is better known as Apache Web Server, and its documentation is available by googling "centos 7 httpd"

nginx is a much smaller and lighter web server, and its documentation is available by googling "Centos 7 nginx

Either one will do a perfectly good job handling the requirements you've specified.

Hint: You will place your "windows.tar" file into a specified server directory. What you also want to do to prevent accessors from seeing any other content you might have in that directory is to "touch index.html" there. This will make a zero-length file which will prevent the nginx or httpd default splash screen from displaying, and won't give away the software you are using -- which hackers want to know if they decide to target your server.

But do all of that after you've installed your preferred product. You'll do something like this link (in your favorite web browser): http://192.168.2.2/

What that should do is to show you the default splash screen. At that point, once you have the splash screen visible, you can add your content to replace it.