Firmware archive named only with the code W26361-W109-Z1-02-36. W26361 is the prefix Fujitsu uses for its mainboard part numbers, and the trailing digits likely give a revision, but the device model is not stated. The 3.53 MB RAR presumably contains a BIOS image. Extract it and compare the code with the sticker on your board. Check that the image size matches the flash chip, and read and save the original contents before writing anything.
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 @biosarchive. 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.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →