RAR archive of 3.57 MB named PEGA_P0JBC, filed as a generic archive with no brand or type details. PEGA is likely Pegatron, an ODM, and P0JBC appears to be a project or board code, but the name does not say what the archive holds. A related file in the index ties this code to an Acer Switch SW5-014P, so it may contain firmware for that machine. Extract and inspect the contents, and verify the board marking before using any image for flashing.
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 @vinafix_bios. 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)