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.TEX File Extension


File Type 1 LaTeX Source Document  (Most common)
File Format File
Common? No
File Description Document prepared by LaTeX, a high-quality typesetting system; can include text, symbols, mathematical expressions, and graphics; commonly used in computer science, electrical engineering, and physics for typesetting articles, books, and other publications.

LaTeX files also use the .LATEX extension.
Program(s) that open tex files Mac: LyX/Mac; MacTeX; Skim
Windows: LaTeX Editor; proTeXt; XEmTeX
Unix: LaTeX Editor

File Type 2 Texture File
File Format Standard File
Common? No
File Description Bitmap image used for storing textures; can create the appearance of different surfaces and can be applied to both 2D and 3D objects; texture files are often used in video games (such as first person shooters) that support 3D texture-mapping.
Program(s) that open tex files Mac / Windows: Programs that reference textures or use texture-mapping; May possibly be opened with an image editor

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/tex