Opening CLS Files

The CLS file type is primarily associated with LaTeX.

CLS	File extension: CLS
	File type:	document stylesheet

What is a CLS file?

CLS files mostly belong to LaTeX by LaTeX Project. A CLS file is a document style created with LaTeX document typesetting system. It contains commands that control the appearance of a document's structure. CLS is also the filename extension of a class definition and/or class module created with Visual C++ and Visual Basic development environments. Visual C++ and Visual Basic have been integrated into Visual Studio. Another type of CLS file contains geocoding classifications used by ArcGIS geospatial data visualization program. SQLite relational database management library uses some data saved in a CLS file. Salesforce products use a CLS file to store classes written in Apex programming language.

How to open CLS files

You need a suitable software like LaTeX to open a CLS file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CLS file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CLS file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CLS Text Viewer

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Programs that open and convert CLS files:

LaTeX by LaTeX Project
See the previous paragraphs to learn more about the main application. CLS files are often referred to as LaTeX developers because this type of file is primarily created or used by this software.
ArcGIS (geocoding classification) by ESRI
ArcGIS is a geospatial data visualization and data analysis software suite available as a desktop and web application. It uses geocoding classification saved in a CLS file. This file format is classified as GIS.
Developer Console (class) by Salesforce
Developer Console is an integrated development environment for writing, debugging, testing, and deploying applications in a Salesforce organization. It uses a CLS file to store a class containing custom triggers, actions and other code written in Apex programming language. Apex is based on Java idioms. This file format is classified as Developer. Related links: Apex
PDF Tools (document) by Winnovative
PDF Tools is a software suite for creating, editing, and publishing documents in Portable Document Format (PDF). It uses a CLS file to store a document in PDF format. This file format is classified as Data.
Visual Studio (class module/definition) by Microsoft
Visual Studio is an integrated development environment for building cross-platform applications. It uses a CLS file to store class definitions and/or class modules. This file format is classified as Developer.

CLS file format:

A file format defines how the data in the file is structured. The file format can be determined based on the file extension and the signature (the first few characters of a file). Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. When there is a problem with a file, the first step to solving it is to determine the file format. Our analysis of the CLS files produces the following result:

The CLS file extension is quite common and is used by different programs with different formats. However, the following two file formats are common:

25% of all CLS files are Visual Basic class definition files. These files contain text and words, not binary data. A typical file size is 240 bytes. The file type is old but is used even today. The keywords BEGIN, MultiUse = -1 'True, VERSION 1.0 CLASS, Attribute VB_GlobalNameSpace = False, Attribute VB_Name, Attribute VB_Creatable = False, Attribute VB_PredeclaredId = True and Sheet are typical for these files. The file name Sheet1.cls is typical for these files. Files like these have the following tags: this, hoja, form, analizer, document, workbook, outlook, session, feuil and plan.
8% of all CLS files have the same signature public . If you open these files in a text editor, you can view and read the content yourself. The files are often between 370 bytes and 9 KB in size. Certain words are almost always found in the files, such as public static, sharing class, String, public class, List and public with. These files are attributed to deal, trigger, helper, controller, handler and team.

The remaining 67% of all CLS files are files with no common format, such as PDF, ZIP, Source, HTML, NeedsTeXFormat, isTest, LZxrBhRgT and global. These files are often connected to data, report, exercise, service, save, account or resume. Drag & drop your file here to see the file format and a preview of your CLS file!

Technical Data for CLS File Extension

File classification:

Developer

Related files:

csl, tex, chip, zip, copy0, trigger, bas, clc, chls, pdf, txt, clg, dim, adv, exe, rnk, class, bst, csv, cld, dvi, dtx

Related links:

Understanding packages and class files

Mime type:

text/x-vbasic, text/x-java, text/x-stex

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: VisualBasic.ClassModule, FileType: Visual Basic Class Module, AppName: Visual Basic
EXEFile: vb6.exe

ProgramID: VisualBasic.ClassModule
EXEFile: %ProgramFiles%\Microsoft Visual Studio\VB98\vb6.exe %1

ProgramID: VisualBasic.ClassModule
EXEFile: F:\VisStudio\VB98\vb6.exe %1

ProgramID: VisualBasic.ClassModule
EXEFile: %ProgramFiles%\VB98\vb6.exe %1

ProgramID: VisualBasic.ClassModule
EXEFile: %ProgramFiles%\DevStudio\VB\vb5.exe %1

ProgramID: WinEdt.cls
EXEFile: %ProgramFiles%\WinEdt Team\WinEdt\WinEdt.exe %1

ProgramID: VisualBasic.ClassModule
EXEFile: %ProgramFiles%\VB6\VB98\vb6.exe

ProgramID: clsfile
EXEFile: %ProgramFiles%\ExamView Trial\evmanage_trial.exe

ProgramID: Microchip Application Maestro.Document
EXEFile: %ProgramFiles%\Microchip\MpAM\MpAM.exe

Show all 9 listings To Top

a cls document stylesheet is a special file format by LaTeX Project and should only be edited and saved with the appropriate software.

How to solve problems with CLS files

Associate the CLS file extension with the correct application.
Update your software that should actually open document stylesheets. Because only the current version supports the latest CLS file format. Search, therefore, e.g. on the LaTeX Project manufacturer website after an available LaTeX update.
To make sure that your CLS file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CLS file online - secure, fast, and no downloads needed.