Another copy of the Openbox S3 Micro firmware at version 1.39, stored as a 3.50 MB ZIP whose name carries a duplicate-copy suffix, so the contents are likely the same as the regular v1.39 package. Compare file sizes or checksums with the other copy before choosing which one to flash. The image is used to recover or update the receiver when it hangs or misbehaves. Check the exact model label on the box, save user settings beforehand and keep the supply steady during the write to avoid bricking the unit.
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.