Please zip your entry into a compressed file for upload
Zipping files with Windows XP
Select your file. Right-click on your selection to bring up the context menu, and move your mouse over Send To, revealing a new menu. Click on Compressed (zipped) folder. You will see a new file icon appear in your Explorer window, representing the new zip archive that you’ve created.
Creating a compressed archive with Mac OS X
Select your file, then click on the word File in the top left corner of your screen. In the new menu that appears, locate and click on Create archive of …., which will be followed by the name(s) of your selection. A new file will appear, representing the compressed zip archive containing all the original files you selected. This new file will have a .zip file extension.