Archive tied to the Y23A-MB-B motherboard, revision B, packed as a 319 KB rar that appears to accompany a boardview of the same name. The name does not reveal a brand or model. Such layout material helps when tracing signals, locating MOSFETs and power ICs, or checking a short on a specific rail. Unpack it and open the content in a boardview viewer, then compare the Y23A code and revision B on your board before relying on it.
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 @SCHEMATICWORLD. 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)