I built an Open Source Miller Columns File Explorer for Windows because I missed macOS Finder.

As a developer moving between macOS and Windows, the "Reverse Culture Shock" of file navigation was real. I deeply missed the Miller Columns (column view) and the Quick Look feature from macOS Finder. Windows Explorer felt clunky, slow, and lacked the productivity tools power users need. So, I decided to build my own: SPAN Finder. 🌲 Why Miller Columns? Traditional Windows navigation requires constant "Back" clicks or multiple windows. With Miller Columns, you can navigate deep directory structures horizontally. You always know exactly where you are and where you came from. 🚀 Built for Speed (WinUI 3 + .NET 8) C# doesn't have to be slow. SPAN Finder uses Async I/O and SemaphoreSlim to handle directories with 14,000+ items without a single UI freeze. It's lightweight, responsive, and native to Windows 11. 🛠️ Key Features for Power Users: Multi-Tab & Split View: True dual-pane workflow with session restore. Quick Look (Spacebar): Preview code, images, and PDFs instantly. Developer Tools: