RAR archive of roughly 186 KB tied to the UX32LA-LN mainboard, revision 1.1, an earlier revision than the 2.0 board of the same model. The file name gives no hint of the exact contents, so extract it and inspect it before relying on it. The small size points to a boardview or similar single-document file. Revision 1.1 and 2.0 boards can differ in parts placement and rail routing, so match the revision printed on the PCB before tracing signals or locating test points.
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.