.CAJ 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 .CAJ file recovery guide for Windows, MacOS, Android and IOS in 2024.

CAJ File Recovery

What is a .CAJ file?

A CAJ file is a document format developed by China National Knowledge Infrastructure (CNKI) and is used for storing Chinese Academic Journal articles. It contains text from a published article, which includes authors, citations, annotations, and other data related to the article.

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

There are several common causes for ".CAJ" file loss or failure:

  1. Accidental deletion: Users may accidentally delete ".CAJ" files while organizing or cleaning up their computer's storage.
  2. Software or hardware issues: Issues with the software used to open or edit ".CAJ" files, such as corruption or incompatibility, can lead to file failure or loss. Similarly, hardware failures like disk errors or system crashes can result in file loss.
  3. Virus or malware attacks: Malicious software can infect and corrupt ".CAJ" files, making them inaccessible or causing them to be deleted.
  4. File system errors: Errors in the file system, such as file system corruption or errors during file transfer or storage, can cause ".CAJ" files to become lost or damaged.
  5. Unintentional formatting: Accidentally formatting the storage device containing ".CAJ" files can result in their loss.
  6. Power outages: Sudden power outages or improper shutdowns can interrupt file operations and lead to ".CAJ" file loss or corruption.
  7. Human errors: Mistakes made by users, such as overwriting or saving changes incorrectly, can result in ".CAJ" file loss or failure.
  8. Physical damage: Physical damage to storage devices, such as hard drives or memory cards, can render ".CAJ" files inaccessible or lost.

It is important to regularly back up ".CAJ" files to minimize the risk of loss or failure.

How to recover lost ".CAJ" 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 ".CAJ" 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 ".CAJ" file is always to create it once more.

Use programs for recovering ".CAJ" 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 ".CAJ" 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 ".CAJ" 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 ".CAJ" extension?

Looking for how to open a stereo chinese Academic Journal File image file file?

Programs that open ".CAJ" files


Additional Information

  • File type: Chinese Academic Journal File

  • File extension: .CAJ

  • Developer: China National Knowledge Infrastructure

  • Category: Page Layout Files

  • Format: N/A

  • Mime-type: application/octet-stream

  • HEX: 25 50 44 46 2D

  • ASCII: %PDF-


We will be happy to answer your questions!

Comments (1)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 18.12.2019 15:58 #
    Leave a comment if you have any questions about Recovering lost .CAJ 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 is a ".CAJ backup" file and how is it different from other backup file formats?

    A ".CAJ backup" file refers to a backup file format used by the Chinese Academic Journal (CAJ) database. The CAJ database is a comprehensive collection of academic journals and articles in various disciplines.

    The .CAJ backup file format is different from other backup file formats due to its specific association with the CAJ database. It contains a compressed and encrypted archive of the academic journals and articles stored in the database. This format is designed to be used with the CAJViewer software, which allows users to access and read the content of the backup file.

    Compared to other backup file formats like .ZIP or .RAR, the .CAJ backup file format is specialized for academic journal databases. It is not as widely used or compatible with general-purpose backup software or tools.

  • How can I create a ".CAJ backup" file for my documents or data?

    To create a ".CAJ backup" file for your documents or data, you can follow these steps:

    1. Install and open the CAJViewer software on your computer. This software is commonly used to read ".CAJ" files, but it also allows you to create backups.
    2. Once you have CAJViewer open, go to the "File" menu and select "New" or click on the "New" icon in the toolbar.
    3. A new window will appear. In this window, click on the "Add Files" or "Add Folder" button to select the documents or data you want to include in the backup. You can select multiple files or an entire folder containing the files.
    4. After selecting the files or folder, click on the "Next" button.
    5. In the next window, choose the destination folder where you want to save the backup file. You can also provide a name for the backup file.
    6. Once you have selected the destination and provided a name, click on the "Finish" button to start creating the backup.
    7. The software will then create a ".CAJ backup" file in the specified location, containing your selected documents or data.

    It's important to note that the ".CAJ backup" file created using CAJViewer is specific to this software and may not be compatible with other applications. Therefore, you will need to have CAJViewer installed to access the backup and restore the files if needed.

  • What software or tools can be used to open and restore a ".CAJ backup" file?

    To open and restore a ".CAJ backup" file, you can use the following software or tools:

    1. CiteSpace: CiteSpace is a popular tool used for visualizing and analyzing scientific literature. It supports the opening and restoration of ".CAJ backup" files.
    2. CiteSeerX: CiteSeerX is a digital library and search engine for scientific and academic papers. It also supports the opening and restoration of ".CAJ backup" files.
    3. CAJViewer: CAJViewer is a software developed by China Academic Journals (CAJ) to open and view ".CAJ" files, including backup files. It allows you to restore the backup and access the content within.
    4. iReader: iReader is an e-book reader developed by China National Publications Import & Export Corporation (CNPIEC). It supports various file formats, including ".CAJ" files, and can be used to open and restore ".CAJ backup" files.
    5. Adobe Acrobat Reader: Adobe Acrobat Reader is a widely used PDF reader that can also open some other file formats. It may be able to open and restore ".CAJ backup" files, depending on the specific file.

    Note: ".CAJ backup" files are primarily associated with Chinese academic journals and databases. The availability and compatibility of the above tools may vary depending on your location and access to these resources.

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