.LEX File Extension
File TypeAdobe Linguistic Library Data File
This file is saved in a binary format, which requires a specific program to read its contents.
What is a LEX file?
Lexicon data file created by Linguistic Library, an Adobe development kit used to add linguistic services, such as spelling and grammar checkers, to Adobe products; contains the shared lexicons, or words and their syntax, for a language; used to store language-specific data for document validation in Adobe products.
LEX files can be used across multiple Adobe products, including Acrobat, Photoshop, InDesign, and Illustrator.