RAR archive of 1.08 MB named AXJ1, a short code that does not clearly identify a laptop brand, model or board revision, though it may be a platform or project name. Contents are unknown from the name and could be a schematic, boardview or BIOS dump. Open it and look for board numbers in the documents, then match them against the PCB silkscreen; if it contains firmware, verify the image size against the flash chip and back up the original first.
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 @hrtechno. 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)