RAR archive of 17.8 MB named only A115F, which most likely refers to the Samsung Galaxy A11 SM-A115F. The name gives no hint of the contents, which could be schematics, a boardview or firmware, so open it and check what is inside before using it. If it contains repair documents, compare the model code on the phone label first. If it holds firmware, make sure the binary region and version are compatible before flashing, because flashing the wrong firmware can leave the phone unable to boot.
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 @esquemaseletricos. 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.