: You will need a tool like 7-Zip (Windows) or The Unarchiver (Mac) to extract the contents. Extract : Right-click the file and select "Extract here."
If you can tell me or what you are trying to build , I can give you more specific instructions on how to use the "paper" elements inside. Ember Snow.7z
: The archive may contain printable PDF or PDO templates used to build 3D paper models. : You will need a tool like 7-Zip