This is the user interface which will let you browse through zipped files on your computer and also a box where you can drag large files for zipping.
Select all the files you wish to zip and then simply drag them to the main Free Zip Viewer window
a - browse from the user interface and choose the zipped file which you would like to open
b - double click on the folder and click "Extract to". You may be asked for a password, which the sender of the file will give you.
c - choose the location or folder in which you would like the extracted files to be placed
d - your files will appear in your chosen location