ZIP archive, 821 KB, named M5A78L-M-LE, an LE variant of a desktop motherboard model. The name gives no file type or revision, so open it and check what is included. Related variants such as LX share most of the name, so confirm the exact suffix on the PCB before using firmware from here. If it contains a BIOS image, read and store the original chip with a programmer and make sure the dump size matches the flash chip before writing.
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.
Built-in OS tools7-Zip