Compressed RAR package, around 128 KB, containing a PCB drawing in DWG format for the Orange Pi Mini single-board computer. The name gives no revision, so check the drawing title block against the version marked on your board. Such a file normally documents physical dimensions, mounting holes and connector locations, useful for enclosure work, panel cut-outs or confirming where a part sits on the board. Open it with AutoCAD or a free DWG viewer; for tracing circuits or rails you will need the separate schematic instead.
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 @boardview. 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.