In the vast, sprawling library of the internet, files are constantly being uploaded, downloaded, shared, and archived. Most of these files have clear, descriptive names— vacation_photos.zip , report_final.docx , or install_setup.exe . However, every seasoned internet user or IT professional has, at one point or another, encountered a file with a name that looks more like a serial number than a description. One such example is the cryptic filename: .