An LTX file is a document created using the LaTeX typesetting language. It contains LaTeX markup tags and properties that define the document structure and content. LTX files can include the actual document text or reference the text from other files.
Settings file used by S.T.A.L.K.E.R., a first-person shooter game; contains parameters for game engine properties such as the physics model settings, graphics, and weapon characteristics; stored in a plain text format and sometimes "modded" to customize gameplay.