A method, apparatus and computer-readable medium for extending the functionality of an operating system is described. The method comprises installing an installable file system as a root file system of the operating system, mounting a default file system of the operating system as a folder accessible by the installable file system and using the installable file system to process data between the operating system and the default file system. The apparatus is a system for extending the functionality of an operating system comprising a computing device comprising a processor and a memory for executing the operating system, wherein the operating system mounts an installable file system other than a default file system of the operating system as a root file system and the installable file system mounts the default file system of the operating system as a folder.