RAR archive labelled Dell N4050, about 1.47 MB, with no board number, revision or content type given in the name. At this size it most likely holds a schematic or a boardview rather than a BIOS image, but extract it to be sure. Inspiron boards were often made by outside designers such as Wistron or Compal, so read the board number on the PCB and check it matches the documents inside. A matching schematic lets you trace power-on sequencing, charger faults and shorted rails efficiently.
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 @schematicslaptop. 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.