Yes, yrag knows and he just told you. You change the file extension. Do you know how to do that? OK, just once here's a more detailed explanation. But gotta tell ya, this forum is not for teaching people the basics on how to use their computer.
You should be in windows explorer and find the logonxp file you've downloaded. Put your cursor on the file name which will highlight the name, right click your mouse and there will be "rename" on the resulting drop down menu, go to rename and click the mouse. The file name can then be edited. You'll see like blahblah.logonxp as the file name and what you want to change is just the extension, the bit after the period. So you would change it to blahblah.zip. Click away on a blank space so the name stays. Once it's renamed double click on the file and it should bring up your zip program. Unzip the file to your logonxp directory.
If that's not explanation enough, it'll have to do. I'm done.