RAR package of about 3.13 MB for the MSI AE2400 all-in-one PC, board identifier MS-AE111 at revision 3.2. The name does not list the contents, and the larger size suggests more than one document, possibly a schematic with a boardview, though only extraction will confirm it. All-in-one boards combine desktop-style power circuits with laptop-like compact layouts, so the documents are useful for tracing supply rails, backlight and panel signals. Match the board marking and revision 3.2 on the PCB 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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.