How to Restore .STG Files from Formatted Drives with Data Recovery Tools

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

How to Restore .STG Files from Formatted Drives with Data Recovery Tools
Data Recovery Tool

What is a .STG file?

Backup created by ActiveSync, a program used to synchronize PCs with mobile devices; contains a backup of all mobile device files, including contacts, notes, and calendar data; typically seen with the filename backup.stg

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

There can be several common causes of ".STG" files lost or failure, including:

  1. Accidental deletion: Users may accidentally delete ".STG" files while trying to clean up their computer or storage devices.
  2. File system corruption: Issues with the file system, such as disk errors or improper shutdowns, can lead to the corruption or loss of ".STG" files.
  3. Virus or malware infection: Malicious software can infect and damage ".STG" files, making them inaccessible or causing failure.
  4. Hardware failure: Problems with the storage device, such as a hard drive failure or bad sectors, can result in the loss or corruption of ".STG" files.
  5. Software or application issues: Errors or bugs in the software or application used to create or manage ".STG" files can lead to their loss or failure.
  6. Operating system issues: Problems with the operating system, such as crashes or software conflicts, can cause ".STG" files to become lost or corrupted.
  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 ".STG" files.

It is important to regularly backup ".STG" files to avoid permanent loss and use reliable data recovery tools in case of accidental deletion or file corruption.

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

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

Looking for how to open a stereo activeSync Backup File image file file?

Programs that open ".STG" files

Windows
Microsoft ActiveSync Microsoft ActiveSync

Additional Information

  • File type: ActiveSync Backup File

  • File extension: .STG

  • Developer: Microsoft

  • Category: Backup Files

  • Format: Binary

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Comments (1)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 18.12.2019 16:45 #
    Leave a comment if you have any questions about Recovering lost .STG 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 are the common signs that indicate a ".STG file" is in need of repair?

    There are several common signs that indicate a ".STG file" is in need of repair. These signs may vary depending on the specific software or application that uses the file format, but here are some general indicators:

    1. Inability to open the file: If you are unable to open the ".STG file" using the appropriate software or application, it could be a sign of file corruption or damage.
    2. Error messages: When trying to access or use the ".STG file," you may encounter error messages indicating that the file is corrupted, unreadable, or incompatible.
    3. Missing or distorted data: If the file contains important data or information, you may notice missing or distorted content when you open it. This can include missing text, images, formatting, or other elements.
    4. Freezing or crashing software: When attempting to open or work with the ".STG file," the software or application may freeze, crash, or become unresponsive. This can be a sign of file corruption affecting the program's functionality.
    5. Unexpected file size changes: If the file size of the ".STG file" is significantly larger or smaller than expected, it could indicate file corruption or damage.
    6. Slow performance or system issues: If your computer or system experiences slow performance, frequent crashes, or other issues when working with the ".STG file" or related software, it may be a result of file corruption.

    In such cases, it is recommended to attempt repairing the ".STG file" using appropriate file repair tools or seeking assistance from the software or application's support team.

  • Are there any reliable software tools available for repairing corrupt or damaged ".STG" files?

    There are several software tools available for repairing corrupt or damaged ".STG" files. Here are a few reliable options:

    1. DataNumen Outlook Repair: This tool is specifically designed to repair corrupt or damaged Outlook storage files (.pst and .ost), which also includes the ".STG" files. It supports batch recovery, advanced recovery options, and a high success rate.
    2. Stellar Repair for Outlook: This software can repair corrupt or damaged Outlook data files, including ".STG" files. It can recover emails, attachments, contacts, calendars, and other mailbox items. It also provides a preview of recoverable data before saving.
    3. Remo Repair Outlook (PST): This tool is known for its efficient repair capabilities for Outlook data files, including ".STG" files. It can fix corruption issues and recover emails, contacts, tasks, notes, and other Outlook attributes.
    4. SysInfoTools Outlook PST Recovery: This software can repair and recover corrupt or damaged Outlook PST files, which includes ".STG" files. It can restore emails, contacts, calendars, tasks, journals, and other mailbox items.

    It is important to note that the effectiveness of these tools may vary depending on the level of corruption or damage to the ".STG" files. It is recommended to try the trial version of any software before making a purchase to ensure it meets your requirements.

  • What steps can be taken to manually repair a ".STG" file if software tools are not successful?

    If software tools are not successful in repairing a ".STG" file, you can try the following steps to manually repair it:

    1. Make a backup: Before attempting any manual repairs, it is crucial to create a backup copy of the original ".STG" file. This ensures that even if the manual repair process fails or causes further damage, you still have the original file to fall back on.
    2. Open the file in a text editor: Use a text editor, such as Notepad or Notepad++, to open the ".STG" file. This allows you to examine the file's contents and potentially identify any corrupted or problematic sections.
    3. Identify and remove corrupt data: Look for any sections within the file that appear to be corrupted or contain unusual characters. You can try removing these sections entirely or replacing them with known good data from a backup file.
    4. Repair file headers: The file header contains important information about the file structure. If the header is damaged, it can cause issues. Compare the header structure of the damaged file with that of a working ".STG" file and manually modify the header to match the correct structure.
    5. Check file associations: Ensure that the file extension ".STG" is associated with the correct software application. Sometimes, incorrect file associations can cause issues. Right-click on the file, select "Open With," and choose the appropriate software tool for opening ".STG" files.
    6. Seek expert help: If the manual repair attempts are unsuccessful, it may be necessary to consult with experts or professionals who specialize in file recovery or repair. They may have specialized tools or techniques to recover or repair the ".STG" file.

    Remember, manually repairing a file can be a complex and delicate process. It is always recommended to have a backup and seek professional help if you are not confident in your abilities.
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