.FX File Extension
File Type 1Direct3D Effects File
What is an FX file?
Effects file created for Direct3D, a part of Microsoft DirectX that is used to define the appearance of 3D objects; contains plain text effects properties structured into three sections: variables, functions, and techniques; written using Microsoft's High Level Shader Language (see also .HLSL files).
FX files are used to specify textures, lighting parameters, shading, rendering properties, and other effects.
NOTE: Direct3D technology is only used for Windows programs.
File Type 2ReadyBoot Trace File
.FX File Association 2
System file used by ReadyBoot, a Windows technology that optimizes the boot process, enabling faster system load times; saves a trace of accessed files on the system that Windows uses as a boot plan for the next time the system is started.
ReadyBoot FX files are created and updated in the background after a system restart. They record accessed files from the last few system boots. This historical information allows Windows to calculate a caching plan for the next restart that helps increase system boot performance.
You can find FX files (e.g., Trace1.fx, Trace2.fx, etc.) in the following directory: