The .filelu extension represents a file that has been encrypted using post-quantum encryption technology, designed to protect data against both classical and quantum computer attacks. Files with this extension are secured with advanced encryption algorithms, ensuring future-proof protection for sensitive information. FileLu is a cloud storage provider, established in 2020, offering secure and cross-platform online storage. We provide online storage, remote backup capacity, and advanced uploading and downloading tools. Our mission is to deliver the best and simplest online storage and file-sharing service. Users can securely share their files with family, friends, or anyone around the world.