Archive of 1.55 MB labelled 2pesv-11, apparently the 2PESV board code at revision 1.1 (written in lowercase here). The name gives no brand, model or file type. It appears to share a code, revision and size with another archive named 2PESV11, so the two may be duplicates. Extract it and identify the contents, whether BIOS, schematic or boardview, before using it. Match the code and revision against the motherboard silkscreen, and if writing firmware, back up the existing flash contents first using your 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 @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.