RAR archive of 836 KB labelled G4 ES10ISX. The name points to a board or model code, ES10ISX, with G4 possibly indicating a generation, but it gives no brand, device type or contents. Open it with 7-Zip or WinRAR and identify what it holds. If it is a firmware image, compare its size with the target flash chip and check the board markings against the code. Keep a full backup of the original chip before programming so the device can be restored if needed.
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 @schematicslaptop. 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)