Knowledge

ERROR_EFS_VERSION_NOT_SUPPORT - 6016 (0x1780)

A newer system is required to decrypt this encrypted file.

Updated: Feb 21, 2026

Technical Background

The ERROR_EFS_VERSION_NOT_SUPPORT error code, with the numeric value of 6016 and hexadecimal representation of 0x1780, indicates that a newer version of the Encrypting File System (EFS) is required to decrypt an encrypted file. This error typically arises when attempting to access or manipulate an EFS-encrypted file on a system that does not support the necessary encryption protocol.

Error Details

This error code is specific to operations involving EFS, which is a feature of Windows designed to provide transparent data encryption for files and folders. The error suggests that the current system lacks the required cryptographic capabilities or version to decrypt the specified file.

Common Causes

  • System Version Incompatibility: The operating system on which the operation is being performed does not support the EFS version used by the encrypted file.
  • File Encryption Level: The encryption level of the file exceeds the supported range for the current system configuration.

Real-World Context

This error can occur in various scenarios, such as:

  • Upgrading a Windows operating system to a newer version that supports more advanced EFS features but lacks backward compatibility with older encrypted files.
  • Migrating data from an older system to a new one without proper encryption key management and migration procedures.

Is This Error Critical?

The criticality of this error depends on the specific use case. For applications requiring full access to all encrypted files, this error can be highly disruptive. However, for systems where only certain files are EFS-encrypted, it may not significantly impact overall functionality.

How to Diagnose

To diagnose and resolve this issue, follow these steps:

  1. Review the System Version: Ensure that the operating system version supports the required EFS features. Check the Windows Update history for any recent updates or patches related to EFS.
  2. Verify File Encryption Level: Use tools like cipher in Command Prompt to check the encryption level of the file and ensure it is compatible with your current system configuration.
  3. Check Key Management: Ensure that all necessary keys are available and correctly managed on the new system. Incomplete key management can lead to decryption failures even if the system version supports EFS.

How to Resolve

To resolve this issue, consider the following actions:

  • Upgrade System Software: If possible, upgrade the operating system to a newer version that fully supports the required EFS features.
  • Key Migration: Use tools provided by Microsoft for migrating encryption keys from older systems to new ones. This ensures that all necessary cryptographic material is available on the new system.
  • File Decryption: Decrypt the file using the appropriate tools or methods before performing operations that require full access, such as copying or modifying the file.

Developer Notes

When developing applications that interact with EFS-encrypted files, ensure that your application can handle different encryption levels and system versions. Implement fallback mechanisms to support older systems while maintaining compatibility with newer ones.

Related Errors

  • ERROR_EFS_NOT_ALLOWED (6015 - 0x177F): Indicates that the operation is not allowed on an EFS-encrypted file.
  • ERROR_EFS_NO_RECOVERY (6024 - 0x17C8): Indicates that no recovery agent is available for the encrypted file.

FAQ

Q: Can this error be resolved by simply upgrading the operating system?

A: Yes, if the newer version of Windows supports the required EFS features and all necessary keys are managed correctly, upgrading can resolve the issue. However, ensure that key migration procedures are followed to avoid data loss or decryption failures.

Q: What should I do if my system does not support the required EFS version?

A: You may need to decrypt the file using a tool or method compatible with your current system and then perform necessary operations on the decrypted file. Alternatively, consider upgrading your system software to one that fully supports the required EFS features.

Summary

The ERROR_EFS_VERSION_NOT_SUPPORT error code indicates that the operating system lacks the necessary cryptographic capabilities to decrypt an EFS-encrypted file. Diagnosing and resolving this issue involves ensuring compatibility between the system version and the encryption level of the file, as well as managing keys correctly. Proper planning and key migration can help mitigate issues related to this error.