Copy of a RAR archive for the Samsung SM-M317F, the Galaxy M31s, 1.86 MB in size. Another entry in this index has the same name and size, so this is very likely a duplicate. Its contents are not stated, but for this model code they are probably schematic or service diagram pages. Extract it with an archive tool and compare the files with the other copy. Such documents help trace charging and power rails and connector pinouts during board repair. Confirm the phone is the M317F, not the M315F.
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 @uzb4422. 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.