A 7.06 MB zip archive labelled for the MSI MS-6566 motherboard. Only the brand and project number appear in the name, so the revision and the exact file types inside are unknown until it is extracted. The larger size hints at several documents or a multi-page schematic, though that should be confirmed. MSI prints the MS code on the PCB itself, which makes it easy to match. Use the contents to follow voltage regulators, check shorted rails or locate components, and verify the board revision 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 @IT_SERVICE_WORLD. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.