RAR archive of 3.86 MB described as an activated copy of WinRAR, the Windows archiver used to open rar and zip files. It contains software rather than any schematic, boardview or firmware, and offers no device repair data. Pre-activated installers from unofficial sources may be tampered with, so scanning before use is wise. The official WinRAR trial from the publisher, or a free tool such as 7-Zip, handles extraction of repair archives just as well without the security risk.
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 @oficinacomputadores. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.