C++ Launcher (File updater)

I would like to have a file updater "Launcher" for my game server, I already have one coded in C# but this one is not really what I want and have some compatibility problem. I would like something like that: [login to view URL] It should download a .xml file from a web server and check which file need to be updated, and it need to download and remplace them in the directory, simple as that, with a tools to create the .xml and a way to add my own design to the application. Thank you.