How to Fix .CSO Files Damaged by a Virus on Your System

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 .CSO file recovery guide for Windows, MacOS, Android and IOS in 2025.

How to Fix .CSO Files Damaged by a Virus on Your System
Data Recovery Tool

What is a .CSO file?

Compressed .ISO disk image file used for archiving PlayStation Portable (PSP) games; can incorporate up to nine layers of compression; created by program such as Prometeus and YACC (Yet Another CSO Compressor).

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

There are several common causes of ".CSO" files lost or failure:

  1. Accidental deletion: The most common cause is accidental deletion by the user. It can happen when a user mistakenly deletes the ".CSO" file or empties the recycle bin without realizing that the file is important.
  2. File system corruption: File system corruption can occur due to various reasons such as improper system shutdown, power outages, hardware failure, or software errors. When the file system gets corrupted, it can lead to the loss or failure of ".CSO" files.
  3. Virus or malware infection: Viruses or malware can infect the system and corrupt or delete files, including ".CSO" files. These malicious programs can enter the system through various means such as downloading files from untrusted sources or visiting infected websites.
  4. Hardware failure: Hardware failure, such as a failing hard drive or storage device, can lead to the loss or failure of ".CSO" files. If the storage device becomes inaccessible or stops functioning properly, the files stored on it, including ".CSO" files, may become lost or corrupted.
  5. Software conflicts or errors: Sometimes, conflicts between different software programs or errors within a specific program can lead to the loss or failure of ".CSO" files. This can occur during file compression or decompression processes, where errors can corrupt the ".CSO" file.
  6. Operating system issues: Problems with the operating system, such as crashes, errors, or system updates, can also result in the loss or failure of ".CSO" files. These issues can disrupt file operations and cause data loss.
  7. Human error: Human error, such as accidental formatting of a storage device, improper handling of files, or incorrect file operations, can also lead to the loss or failure of ".CSO" files.

To prevent the loss or failure of ".CSO" files, it is essential to regularly back up important files, use reliable antivirus software, avoid downloading files from untrusted sources, and handle files with care.

How to recover lost ".CSO" 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 ".CSO" file may be deleted.

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🧺 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 ".CSO" file is always to create it once more.

Use programs for recovering ".CSO" 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 ".CSO" 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™ 5.0
The tool recovers data from any devices, regardless of the cause of data loss.
Download

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 ".CSO" 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 ".CSO" extension?

Looking for how to open a stereo compressed ISO Disk Image image file file?

Programs that open ".CSO" files

Windows
UMDGen UMDGen
PSP ISO Compressor PSP ISO Compressor

Additional Information

  • File type: Compressed ISO Disk Image

  • File extension: .CSO

  • Developer: N/A

  • Category: Disk Image Files

  • Format: Binary

  • HEX: 43 49 53 4F

  • ASCII: CISO

  • File types that use the extension .CSO:

    • Compressed ISO Disk Image

    • Compiled Shader Object File

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Comments (1)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 18.12.2019 15:15 #
    Leave a comment if you have any questions about Recovering lost .CSO 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.

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Questions and answers

  • What is the purpose of ".CSO Recovery" and how does it work?

    The purpose of ".CSO Recovery" is to recover and repair corrupted or damaged PSP (PlayStation Portable) game files that are in the CSO format. CSO is a compressed ISO file format commonly used for PSP game backups.

    When a CSO file becomes corrupted or damaged, it may not work properly or fail to load in the PSP emulator or device. The ".CSO Recovery" feature aims to fix these issues by repairing the file.

    The exact workings of ".CSO Recovery" can vary depending on the specific software or tool being used. In general, it involves analyzing the CSO file structure, identifying any errors or inconsistencies, and attempting to fix them. This process may involve reconstructing missing or corrupt data, adjusting file headers, or resolving other issues that may be causing the file to be unreadable.

    It's important to note that not all CSO recovery tools or methods are guaranteed to be successful, as the extent of file corruption or damage can vary. Additionally, it's always recommended to have a backup of the original CSO file to avoid any potential data loss during the recovery process.

  • Are there any specific tools or software available for recovering .CSO files?

    Yes, there are several tools and software available for recovering .CSO files. Some of the popular ones include:

    1. UMDGen: It is a free tool specifically designed for working with PlayStation Portable (PSP) game files, including .CSO files. It allows you to extract, create, and modify CSO files.
    2. PowerISO: This is a powerful CD/DVD/BD image file processing tool that supports various formats, including .CSO. It can be used to extract and create CSO files.
    3. WinRAR: Although primarily used for compressing and decompressing files, WinRAR can also handle CSO files. It allows you to extract the contents of a CSO file to a folder on your computer.
    4. PSP ISO Compressor: This tool is specifically designed for compressing ISO files to the CSO format. It can also decompress CSO files back to the original ISO format.
    5. CisoPlus: It is a Windows-based tool that can compress and decompress CSO files. It offers various compression levels and supports batch processing.

    It's important to note that these tools may have different features and compatibility with different operating systems. It's recommended to check the system requirements and user reviews before choosing a specific tool for recovering .CSO files.

  • What are the common reasons for .CSO file corruption and how can one prevent or recover from it using ".CSO Recovery"?

    The .CSO file format is commonly used for compressed ISO disk images in the gaming industry. Corruption of .CSO files can occur due to various reasons, including:

    1. File system errors: Issues with the file system, such as bad sectors on the storage device or improper shutdowns, can lead to file corruption.
    2. Software or hardware issues: Problems with the software used to create or extract .CSO files, or hardware malfunctions, can result in corruption.
    3. Malware or viruses: If a .CSO file gets infected by malware or viruses, it can become corrupted or inaccessible.

    To prevent .CSO file corruption, you can:

    1. Use reliable software: Ensure that you use reputable software for creating, extracting, or modifying .CSO files. This reduces the chances of corruption due to software-related issues.
    2. Maintain a healthy storage device: Regularly check and fix any file system errors on your storage device using built-in tools like CHKDSK (Windows) or Disk Utility (Mac). Additionally, avoid sudden power outages or system crashes while working with .CSO files.
    3. Keep your system secure: Use up-to-date antivirus software to protect your computer from malware or viruses that can potentially corrupt .CSO files.

    In the event of .CSO file corruption, you can try using a ".CSO Recovery" tool to recover the data. However, it is important to note that such specific recovery tools may not be widely available or reliable. Instead, you can attempt the following general methods:

    1. Use a backup: If you have a backup of the original .CSO file, restore it to recover the data.
    2. Try alternative extraction tools: Use different software or tools to extract the contents of the .CSO file. Sometimes, an alternative tool may handle the corruption better.
    3. Repair the file: Some file compression software may offer options to repair corrupted .CSO files. Explore the features of the software you are using to see if it provides any repair functionality.
    4. Seek professional help: If the .CSO file contains critical data and none of the above methods work, consider reaching out to professional data recovery services. They may have specialized tools and expertise to recover data from corrupted .CSO files.

    Remember to always maintain backups of important files to mitigate the impact of file corruption.
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