By creating a ZIP-compressed folder and dragging and dropping other files into it, the original file sizes get reduced and take up less space. Identify ZIP files by their zipper icon. Unlike some other compressed file types, they do not affect the performance of your computer. You can then work more efficiently, while still saving space.
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Right-click on any open space on your Windows 7 desktop. Select "New," "Compressed (Zipped) Folder," then press "Enter."
Right-click once on the new compressed folder, select "Rename" and type in a new name for the folder.
Drag and drop the selected files and folders of your choice to the Zipped folder.