Lenovo ThinkPad Edge E255 file, an 889 KB RAR archive. Only the model is named, with no board number, ODM or revision, so confirm compatibility by comparing the motherboard code with the document's title block. A schematic PDF is the most likely content. With it a technician can trace the DC input and charger, check the standby and system rails at test points, and locate components when a shorted rail stops the machine from powering on.
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.
7-ZipWinRARThe Unarchiver (macOS)