Archive named G973F, the model code of the Samsung Galaxy S10 international variant, packed as a 7.70 MB RAR. The name does not say whether it holds schematics, boardview, service documents or firmware parts, so extract it with WinRAR or 7-Zip and inspect the contents. Repair packages for this model are normally used to trace power rails, locate components and test points and diagnose shorts on the stacked board. Check that the model code and board revision on the phone match before relying on the data.
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 @cyberlanelectonik. 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.