I am new to a mac and have the download setting set up to drop on desktop when I download something. My question is that I downloaded some widgets today for the desktop like "The Weather Channel" one. When it finished downloaded, it appeared on the desktop as two files a zip file and another file. I then had to click on it to run it but in the end I had to move the zip file to the trash after I was done installing it. Is that normal. Should there be two files each time. Do I need to turn on/off a setting. Also happened when I clicked on a video to watch, I was streaming it but when I flashed to my desktop it downloaded it also. Is this normal.