An archive of repair files for Acer hardware. Shared as “AFS Acer Spin 3 SP315-51 - PEGATRON ST5DB STRDB.rar” — a .rar file, 2.70 MB.
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 @afsschematicfree. 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.
7-ZipWinRARThe Unarchiver (macOS)