Small RAR archive labelled for the ASRock B760 PRO RS WIFI desktop motherboard, revision 1; the name does not say what it holds, and at 145 KB it is too small to be a full BIOS image, so it may be a schematic page, boardview or documentation. Extract it and check the contents before use. For board repair, confirm the revision printed on the PCB is 1, since layout and component changes between revisions can make reference files inaccurate.
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 @Boardviewno. 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)