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The files are provided in RAR format. To extract them, use WinRAR on Windows or The Unarchiver (or a similar tool) on macOS.
Inlet Shape Key Collections presents The Shape Key Collection tool that helps to manage the shape keys in Blender. This new development enables the users to arrange shape keys within folders and subfolders for easier storage and retrieving.
Image 1: Combine related shape keys for more efficient management and control of your mesh.

Image 2: Rename and arrange shape keys into designated folders and subfolders.

.py files or a folder:.py files are inside a folder.