Callback File System is an open-source application that provides a set of APIs and tools for developers to create file system drivers for Windows. It allows developers to create file system-related applications and services, such as file storage, backup, and synchronization. It provides an abstraction layer between the Windows operating system and the file system, allowing developers to easily create and maintain their own custom file systems. It also includes features to improve performance and reliability, such as disk caching, multi-threaded I/O, and support for multiple file systems. It is also compatible with Windows XP, Vista, 7, and 8.
The discontinued Fuse4X has been merged with the OSXFUSE project.