ZIP archive of 2.72 MB named AM1l, which appears to be a motherboard model identifier, though the name gives no further details. Contents are unspecified and could include a firmware image, schematic or other repair files. Extract it with any archiver and check what it holds before use. If it contains a BIOS dump for flashing, save the original SPI chip contents first, confirm the image size matches the chip capacity, and verify the board model printed on the PCB corresponds to this file.
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 @laptopchiplevelrepair. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.