If you are unsure of the file's origin, do not double-click it. Use these methods to inspect it safely: Safely insert external content into a page - MDN Web Docs

Because .html files can execute , opening an unknown "TB Pack.html" from an untrusted source carries risks:

: JavaScript used to handle video playback, image lightboxes, or search filters. Safety and Security Risks

: Navigation buttons to switch between different media categories.