A file executing method for executing a computer executable code set stored in a hidden storage area of a storage device in an operating system of a computer host is provided. The method includes connecting the storage device to the computer host and providing a loader for managing the computer executable code set. The method also includes running the loader in a main memory of the computer host, requesting the operating system to allocate a first address segment in the main memory for running the loader, loading the computer executable code set from the hidden storage area into the first address segment by using the loader, transforming the computer executable code set into an executable content of the operation system by using the loader and storing the executable content into the first address segment; and establishing a derivative execution procedure by using the loader to execute the executable content.