Archive labeled for the HP EliteBook Folio 9480m, 6.15 MB RAR. The name gives no board number, revision or contents, so it is unclear whether it contains BIOS, schematic or boardview material until opened. Inspect the files and compare any board number they reference with the one printed on your PCB. If it contains a firmware dump, save the original flash contents first and verify the image size matches the chip before programming it with an external programmer.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @laptopbios21. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)