.X File Extension

2 file types use the .x file extension.

1.DirectX Model File
2.Lex Source Code File

DirectX Model File

Developer	Microsoft
Popularity	4.1 \| 56 Votes

What is an X file?

3D image file used by DirectX technology, which is often used for rendering 3D graphics in games; may contain specifications for meshes, textures, animations, and objects; can be exported using the DirectX SDK plugins for 3ds Max and Maya, or with custom exporters for programs such as Blender and DeleD.

Programs that open or reference X files

Windows

Microsoft DirectX SDK — Discontinued

Free

Lex Source Code File

Developer	N/A
Popularity	3.7 \| 16 Votes

Source code written in the Lex programming language (a standard lexical analyzer for Unix); may be processed with the lex utility included with most Unix distributions to generate a C program; the output is often written to a file named "lex.yy.c."

More Information

Lex source code files more often use the .L extension.

Programs that open X files

Windows

Flex for Windows

Microsoft Visual Studio with MKS Lex & Yacc plug-in

Free⁺

Any text editor

Linux

Lex — Discontinued