Anatel (Agência Nacional de Telecomunicações) is Brazil's national telecommunications agency. It's possible that the drivers you're looking for are related to equipment used in Brazil or are specifically approved by Anatel for use in that country.
This is the context, and it dates the request. Windows 7, released in 2009, became the most beloved Windows operating system of all time for many users. However, its "64 Bit" designation was a bridge between eras. While 64-bit computing allowed for more RAM and better performance, it broke compatibility with older 16-bit and 32-bit drivers. Many manufacturers were slow to update their drivers for 64-bit architecture. Consequently, finding a 64-bit driver for an older Anatel card was a notorious headache during the Windows 7 era. Windows 7, released in 2009, became the most