EXE download sites that bundle adware, or forum posts that ask you to run a “downloader.exe.”

SwiftShader 2.1 is a software-based implementation of the OpenGL and Vulkan graphics APIs. It allows users to run 3D graphics-intensive applications, such as games, simulations, and scientific visualizations, on computers with low-end or outdated graphics hardware. SwiftShader 2.1 is designed to provide a seamless graphics experience, even on systems that lack hardware-accelerated graphics support.

files from unofficial "driver download" websites, as these are common vectors for malware. Modern Alternatives: