.CLS File Recovery

Have files been deleted due to a user’s error or software error? Have you formatted a disk by accident and need to know how to recover the files? Read our .CLS file recovery guide for Windows, MacOS, Android and IOS in 2024.

CLS File Recovery

What is a .CLS 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.

What Are Common Causes of ".CLS" Files Lost or Failure?

There can be several reasons for the loss or failure of ".CLS" (Class) files. Some common causes include:

  1. Accidental deletion: Users might accidentally delete ".CLS" files while organizing or cleaning up their computer system.
  2. Software or hardware issues: Problems with the operating system, software conflicts, or hardware failures can lead to the loss or corruption of ".CLS" files.
  3. Virus or malware attack: Malicious programs can infect and damage ".CLS" files, making them inaccessible or causing them to fail.
  4. File system corruption: Issues with the file system, such as disk errors or improper shutdowns, can result in the loss or corruption of ".CLS" files.
  5. Software updates or upgrades: Sometimes, during software updates or upgrades, ".CLS" files can be overwritten or replaced, causing them to be lost or fail.
  6. Incompatible software: Using incompatible or outdated software that is not compatible with ".CLS" files can lead to their failure or loss.
  7. Human error: Mistakes made by users, such as accidental formatting of storage devices or improper handling of files, can result in the loss or failure of ".CLS" files.
  8. Power outages: Sudden power outages or fluctuations can interrupt file operations, leading to the loss or corruption of ".CLS" files.

It is always recommended to regularly back up important files, including ".CLS" files, to prevent data loss in case of any unforeseen circumstances.

How to recover lost ".CLS" files?

Sometimes while working with a computer, laptop or other stationary or mobile devices, you may encounter various bugs, freezes, hardware or software failures, even in spite of regular updates and junk cleaning. As a result, an important ".CLS" file may be deleted.

Go to view
🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

By no means should you think that the only way to recover a ".CLS" file is always to create it once more.

Use programs for recovering ".CLS" files if a file was lost after accidental or deliberate deleting, formatting the memory card or the internal storage, cleaning the storage device, after a virus attack or a system failure.

Programs to recover ".CLS" files

Looking for a way to get files back? In cases when files were deleted and they cannot be restored by using standard operating system tools, use Hetman Partition Recovery.

Partition Recovery™ 4.9
The tool recovers data from any devices, regardless of the cause of data loss.

Follow the directions below:

  1. Download Hetman Partition Recovery, install and start the program.

  2. The program will automatically scan the computer and display all hard disks and removable drives connected to it, as well as physical and local disks.

    File Recovery Software
  3. Double-click on the disk from which you need to recover ".CLS" files, and select analysis type.

    Hetman Partition Recovery - Analysis Type
  4. When the scanning is over, you will be shown the files for recovery.

    Hetman Partition Recovery - Files that Can be Restored
  5. To find a file you need, use the program’s interface to open the folder it was deleted from, or go to the folder "Content-Aware Analysis" and select the required file type.

    Hetman Partition Recovery - Deep Scan
  6. Select the files you have been looking for and click "Recovery".

    File Recovery Software - Files List for Recovery
  7. Choose one of the methods for saving the files and recover them.

    Saving recovered files in Hetman Partition Recovery

How to open file with ".CLS" extension?

Looking for how to open a stereo laTeX Document Class File image file file?

Programs that open ".CLS" files

TeXnicCenter TeXnicCenter
TeXworks TeXworks
proTeXt proTeXt
Texmaker Texmaker
TeXworks TeXworks
LyX/Mac LyX/Mac
Texmaker Texmaker
TeXShop TeXShop
TeXworks TeXworks
Texmaker Texmaker

Additional Information

  • File type: LaTeX Document Class File

  • File extension: .CLS

  • Developer: N/A

  • Category: Misc Files

  • Format: Text

  • HEX: 56 45 52 53 49 4F 4E 20 31 2E 30 20 43 4C 41 53 53


  • File types that use the extension .CLS:

    • LaTeX Document Class File

    • Program Class File


We will be happy to answer your questions!

Comments (1)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 18.12.2019 11:33 #
    Leave a comment if you have any questions about Recovering lost .CLS files after deleting, cleaning or formatting!
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Vladimir Artiukh

Author: Vladimir Artiukh, Technical Writer

Vladimir Artiukh is a technical writer for Hetman Software, as well as the voice and face of their English-speaking YouTube channel, Hetman Software: Data Recovery for Windows. He handles tutorials, how-tos, and detailed reviews on how the company’s tools work with all kinds of data storage devices.

Oleg Afonin

Editor: Oleg Afonin, Technical Writer

Oleg Afonin is an expert in mobile forensics, data recovery and computer systems. He often attends large data security conferences, and writes several blogs for such resources as xaker.ru, Elcomsoft and Habr. In addition to his online activities, Oleg’s articles are also published in professional magazines. Also, Oleg Afonin is the co-author of a well-known book, Mobile Forensics - Advanced Investigative Strategies.


Questions and answers

  • What are the common issues that may require a .CLS repair for a computer system?

    There are several common issues that may require a .CLS repair for a computer system:

    1. Corrupted or missing .CLS files: .CLS (Class) files are used by various software applications to define classes and objects. If these files become corrupted or go missing, it can cause errors or crashes within the associated programs.
    2. Software conflicts: Sometimes, conflicts between different software applications or versions can lead to issues with .CLS files. This can occur when two programs are trying to use the same class or when there are compatibility issues between different versions of the same program.
    3. Malware or virus infections: Malicious software or viruses can infect and damage .CLS files, leading to system instability or crashes. In such cases, a .CLS repair may be necessary to restore the affected files and ensure the proper functioning of the system.
    4. Registry errors: The Windows registry is a database that stores configuration settings for the operating system and installed software. If there are errors or invalid entries related to .CLS files in the registry, it can cause issues with the associated programs and require a .CLS repair.
    5. Operating system issues: Problems with the operating system, such as file system corruption or improper system shutdowns, can also impact .CLS files. These issues can cause errors or prevent certain programs from functioning correctly, necessitating a .CLS repair.
    6. Hardware failures: In rare cases, hardware failures like a failing hard drive or faulty RAM can lead to issues with .CLS files. These failures can corrupt or damage files on the system, including .CLS files, requiring repair or replacement of the affected hardware components.

    It's important to note that .CLS repairs are typically specific to certain software applications or the Windows operating system. The specific symptoms and troubleshooting steps may vary depending on the affected software or system configuration.

  • How can I perform a .CLS repair on my computer if I encounter errors or corruption related to this file?

    To perform a .CLS repair on your computer, you can follow these steps:

    1. Restart your computer: Sometimes, a simple restart can resolve the issue. So, start by restarting your computer and see if the error persists.
    2. Run System File Checker (SFC) scan: SFC is a built-in Windows tool that scans for and repairs corrupted system files. To run an SFC scan, follow these steps:
    • Open the Command Prompt as an administrator. To do this, search for "Command Prompt" in the Start menu, right-click on it, and select "Run as administrator."
    • In the Command Prompt window, type the command: `sfc /scannow` and press Enter.
    • Wait for the scan to complete. It may take some time.
    • If any corrupted files are found, SFC will attempt to repair them. Restart your computer after the process is complete.

    Use Deployment Image Servicing and Management (DISM) tool: DISM is another Windows tool that can fix system corruption issues. To use DISM, follow these steps:

    • Open Command Prompt as an administrator.
    • Type the following command and press Enter: `DISM /Online /Cleanup-Image /RestoreHealth`
    • Wait for the process to complete. It may take some time.
    • Restart your computer after the process is finished.

    Restore from a system restore point: If the .CLS file corruption occurred recently, you can try restoring your computer to a previous state using a system restore point. To do this:

    • Press the Windows key + R to open the Run dialog box.
    • Type `rstrui` and press Enter.
    • Follow the on-screen instructions to choose a restore point and restore your computer.
    1. Reinstall the program associated with the .CLS file: If the error is specific to a particular program, try uninstalling and reinstalling that program. This can replace any corrupted or missing files associated with the .CLS file.
    2. Perform a clean boot: A clean boot starts Windows with a minimal set of drivers and startup programs, which can help identify if any third-party software is causing the issue. To perform a clean boot:
    • Press the Windows key + R to open the Run dialog box.
    • Type `msconfig` and press Enter.
    • In the System Configuration window, go to the "Services" tab and check the "Hide all Microsoft services" box. Then click on "Disable all."
    • Next, go to the "Startup" tab and click on "Open Task Manager."
    • In the Task Manager, disable all startup items by right-clicking on each and selecting "Disable."
    • Close the Task Manager and go back to the System Configuration window. Click on "OK" and restart your computer.
    • After the restart, check if the .CLS file error still occurs. If not, you can selectively enable services and startup items to identify the one causing the problem.

    If none of these steps resolve the .CLS file-related errors or corruption, it may be advisable to seek assistance from a professional or contact the software developer for further support.

  • Are there any specific software tools or techniques that can help in diagnosing and fixing .CLS file-related problems?

    Yes, there are several software tools and techniques that can help in diagnosing and fixing .CLS file-related problems. Here are a few:

    1. Text editors: Use a text editor, such as Notepad++ or Sublime Text, to open and examine the .CLS file. Look for any syntax errors or inconsistencies that may be causing the problem.
    2. Compiler or interpreter error messages: When compiling or interpreting the code that uses the .CLS file, pay attention to any error messages or warnings that are displayed. These messages can provide valuable insights into the specific problem and its location within the .CLS file.
    3. Debugging tools: If the .CLS file is part of a larger software project, you can use debugging tools specific to the programming language or framework to trace and identify any issues. These tools often provide step-by-step execution and variable inspection capabilities.
    4. Version control system: If you are working with a version control system like Git, you can use its diff functionality to compare the current version of the .CLS file with a previous working version. This can help identify any changes or additions that may have introduced the problem.
    5. Online forums and communities: Seek help from online forums and communities specific to the programming language or framework you are using. Describe the problem and provide relevant details, including the .CLS file itself, to get assistance from experienced developers who may have encountered similar issues.
    6. Documentation and official resources: Consult the documentation and official resources related to the programming language or framework that the .CLS file is associated with. These resources often include troubleshooting guides and FAQs that can help you diagnose and fix common problems.

    Remember, the specific tools and techniques may vary depending on the programming language or framework you are working with, so it's essential to consider the appropriate resources for your specific situation.

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