The File Extensions Database

.CLS File Extension

  • Category: Misc Files
  • Format: Text

What is an .CLS file?

.CLS is LaTeX Document Class File

File written in LaTeX, a document markup language often used for typesetting academic papers; stores a class with a predefined typeset configuration that can be imported into a .TEX document; used for storing templates for articles, forms, and other types of documents.

Class files help users generate documents with the same style and structure. For example, a scientific journal publisher may distribute a CLS file to submitting authors so that all articles appear the same in the publication.

LaTeX software installations typically include some CLS files that can be used as document templates.

Programs that open LaTeX Document Class File
File Type 2 Program Class File
Category: Developer Files

Contains "objects" referenced by the source code of one or more programs in a software programming project; may define functions, variables, or various data types.

Saved within a Visual Basic Project (.VBP file), but often saved as a separate file during program development. Compiled into the program during the software compilation process.

Programs that open Program Class File
Microsoft Visual Studio 2017

How to solve problems with CLS files

  • Associate the CLS file extension with the correct application. On :
    Windows: Right click on any CLS file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CLS files". Mac: Right click (or Ctrl-click) the CLS file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CLS is LaTeX Document Class File. Because only the current version supports the latest CLS file format. Search, therefore, e.g. on the N/A manufacturer website after an available .CLS is LaTeX Document Class File update.
  • To make sure that your CLS file is not corrupted or virus-infected, get the file again and scan it with antivirus software.