ERROR_FILE_INVALID - 1006 (0x3EE)
The volume for a file has been externally altered so that the opened file is no longer valid.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_FILE_INVALID error code indicates that a file operation has been attempted on a file whose state has changed due to external alterations. This change renders the opened file invalid for the intended operation.
Error Details
This error is typically returned when an application attempts to perform operations on a file that has been modified or deleted by another process, causing the file handle to become invalid. The specific context in which this error occurs can vary depending on the nature of the file and the operation being performed.
Usage Context
The ERROR_FILE_INVALID error is commonly encountered in scenarios where files are accessed through handles that may become invalidated due to external modifications. This includes operations such as reading, writing, or closing a file handle after it has been altered by another process.
Developer Interpretation
Developers should interpret this error as an indication that the state of the file has changed externally and that the current operation cannot proceed with the existing file handle. The application must either close the handle and attempt to re-open the file or correct any external modifications before proceeding with the intended operations.
Related Errors
ERROR_HANDLE_EOF(38): Indicates an end-of-file condition, which may be related if the file has been truncated externally.ERROR_INVALID_PARAMETER(1208): May indicate that a parameter passed to the operation was invalid, leading to this error.ERROR_FILE_NOT_FOUND(2): The file might have been deleted or moved by another process.
FAQ
Q: What causes the ERROR_FILE_INVALID?
A: This error occurs when an external modification to a file renders its handle invalid. Common causes include file deletion, truncation, or alteration by another process.
Q: How can I prevent this error from occurring?
A: Ensure that all operations on files are performed in a manner that minimizes the risk of external modifications. Use file locking mechanisms if necessary to protect against concurrent access issues.
Summary
The ERROR_FILE_INVALID error code is specific to situations where an application attempts to perform operations on a file whose state has been externally altered, making the current handle invalid. Developers should be aware of this scenario and implement appropriate handling strategies to ensure robustness in their applications.