ZIP archive with CH341 programmer software version 2.0.0.43, with the name adding FWH, likely referring to support for Firmware Hub type chips. CH341A-based USB programmers are cheap tools widely used to read, erase and write SPI BIOS and EC flash chips through a clip or socket. The 3.10 MB package should contain the application and possibly drivers. Before writing, read the chip twice and compare to confirm a stable connection, save a backup, and check the chip voltage matches your programmer setup.
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 @lciitworld. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.