Optimizing Your App's Disk Footprint
Windows 8.1 optimizes the way your apps are packaged and distributed. No longer do we make users download all localized strings, high-scale assets, or DirectX textures just to run their app; now they get only what they need. Do you use a very common library inside your app? No problem. Windows 8.1 also ensure that there’s only one copy of that library (or any duplicate files) on your system.