RAR archive labelled M70-352 together with LA-2871, a Compal-style board number; Compal uses LA-xxxx codes for its laptop motherboards. No brand or contents are specified, so unpack it and check whether it holds a schematic or other service data. Such files are used for tracing power rails, checking the charging circuit and finding components near a short. Confirm that the LA number and revision printed on the PCB match before working from the drawings.
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 @alischematics. 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)