Xiaomi Mi 3 service archive in RAR format, noticeably larger than its neighbours at 14.4 MB. The name gives no indication of contents, so it may combine several schematics, layout files or images and should be extracted and sorted before use. Documents of this type support tracing supply rails, locating test points and identifying components when chasing a no-power, no-charge or display fault. The Mi 3 shipped in more than one chipset variant, so match the drawings against the board in hand before relying on any reference designators.
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 @mischematic. 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.