ZIP archive of 6.12 MB whose name gives no model, board number or brand. The unpass part hints at a password removal tool or unlocked BIOS image, but the exact contents cannot be confirmed from the name alone. Open it and check the included files before use. If it holds firmware for a password reset, identify the target board first, save a full backup of the original SPI chip with a programmer, and confirm the image size matches the flash chip so you can restore the original if anything fails.
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 .zip file
Compressed archive that every operating system opens without extra software.