MSI MS-6502 at revision 0A, packed as a ZIP of roughly 1.09 MB. Only the board number and revision appear in the name, so treat the contents as unverified, most likely a circuit diagram. The board belongs to MSI's MS-65xx desktop motherboard series. Repair work with such a document covers power rail tracing, checking the power-good chain and finding which component pulls a line low. A separate 0B revision exists, so read the revision on your board before following part references here.
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.