Microsoft is addressing sluggish launch times for File Explorer by preloading the application in the background, rather than streamlining its code or removing features. This update is available in a Windows Insider build for the Dev and Beta Channels. The preloading feature is experimental and can be disabled by users in the Folder Options under the View tab in File Explorer. Microsoft previously open-sourced the classic Windows File Manager in 2018, which was a lightweight tool for file system activities. Over time, File Explorer has increased in size and complexity, leading to performance challenges.