Small 92.8 KB archive named only by the number 10260-1, which matches the Wistron board-numbering pattern of five digits with a dash suffix. The name gives no brand, model or content type, so unpack it and inspect what is inside before use. Wistron builds boards for Acer, Dell and others, with the number printed on the PCB. At this size it may be a boardview, an EC firmware or a small BIOS fragment; confirm the board marking and, for firmware, back up the original chip before writing.
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.