Archive for a ZX-H61C motherboard, revision 1.2, judging by the name, which points to a desktop board built around the Intel H61 chipset. The 2.32 MB zip probably contains a BIOS dump, possibly with supporting notes, though the contents are not listed. Technicians use such images to recover boards with corrupted firmware by writing the SPI flash chip with an external programmer. Check that the PCB revision printed near the slots reads 1.2, and back up the existing chip contents before writing anything new.
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.