If you have been browsing digital origami communities, resource libraries, or 3D modeling forums, you might have stumbled upon a file named something like .
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Download a free file manager app like iZip (iOS) or ZArchiver (Android) from your app store.
When someone puts together a massive collection of origami resources, the file sizes can get quite large. To make them easier to upload, download, and share, creators bundle them into a single archive and compress them. Inside a typical origami .7z file, you will usually find:
Full instructional books or independent magazines.
The .7z extension stands for , which is a highly efficient, open-source file compression format.