.FX File Extension

File Type 1

Direct3D Effects File

Developer Microsoft
4.2  |  34 Votes
Category 3D Image Files
Format Text

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).

More Information

FX files are used to specify textures, lighting parameters, shading, rendering properties, and other effects.

NOTE: Direct3D technology is only used for Windows programs.

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Programs that open FX files

Microsoft EffectEdit
Microsoft Dxviewer
Microsoft FXC
Updated October 23, 2012
File Type 2

ReadyBoot Trace File

Developer Microsoft
3.9  |  12 Votes
Category System Files
Format Binary

What is an FX file?

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.

More Information

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:


Programs that open or reference FX files

Updated November 26, 2012

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