Zip archive with an encrypted firmware image for the Openbox HD2 satellite receiver, carrying a numeric prefix 478 that the name does not explain. Encrypted builds are meant for the stock update procedure, typically by USB, on a receiver whose loader still works. Use it to refresh corrupted software or update the box. Confirm the target is an HD2 and not an HD2 Plus or clone with different hardware, check the version inside the archive, and preserve a copy of the current firmware before installing.
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 @tvsoftwareworld. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.