Windows 8.1 reached its end of support on January 10, 2023, meaning it no longer receives security updates from Microsoft. Safety & Verification
While the exact ".rar" string does not appear in official Microsoft documentation , the naming convention "81P" (Windows 8.1 Pro) and "x64" (64-bit architecture) is standard for community-uploaded or archived operating system files. Key Features & Specifications X-81PIx64.rar
A full 64-bit Windows 8.1 ISO is generally around 4.02 GB . Windows 8
x64 (64-bit), supporting modern hardware and more than 4GB of RAM. X-81PIx64.rar