Bootcamp 3.0 does NOT officially support Windows 10 or Windows 11. For Windows 10, you need Bootcamp 6. However, many users have successfully forced Bootcamp 3.0 drivers to work on Windows 10—though you may lose some functionality (like the brightness control).
It allowed Windows users to read files directly from their Mac partitions. Advanced Hardware Support: Bootcamp 3.0 64-bit.exe Download