The SWF files are those that save all kinds of contents as Flash in such a way that they can be integrated into any website, thus, Flash Player XP opens them as if they were on a website. To open the file you will be able to search on your hard drive or search within your browser's cache for SWF files. So if you want to download Flash games to be able to play anywhere, Flash Player XP will allow you to launch them wherever you are. Thanks to the latter, you'll be able to open games without having to have an Internet connection nor a browser.
Flash Player XP is a software application to open any Flash file on your computer.