ERROR_MRM_UNSUPPORTED_DIRECTORY_TYPE - 15122 (0x3B12)
Unsupported directory type.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_MRM_UNSUPPORTED_DIRECTORY_TYPE error code indicates that the system encountered a directory type it does not support during an operation. This error is specific to certain file management routines and operations within the Windows environment.
Error Details
This error typically arises when attempting to perform an operation on a directory that has characteristics or attributes that are not recognized by the current version of the operating system or the specific component handling the operation. The exact nature of unsupported directories can vary, but it often pertains to new or experimental file system features.
Usage Context
This error is most likely encountered in scenarios involving advanced file management operations, such as those performed by third-party applications or during the integration of custom file systems with Windows. It may also appear when dealing with non-standard directory structures that do not conform to typical Windows conventions.
Developer Interpretation
When encountering this error, developers should consider the following:
- Review Operation Context: Ensure that the operation being performed is appropriate for the current environment and system version.
- Validate Parameters: Verify that all parameters passed to file management functions are correct and compatible with the expected directory types.
- Confirm Object Types: Confirm that the directories involved in the operation are of a type supported by the application or component performing the operation.
Related Errors
ERROR_NOT_SUPPORTED(50)ERROR_INVALID_PARAMETER(1238)ERROR_BAD_NETPATH(67)
FAQ
Q: What does this error mean?
A: This error indicates that the system encountered a directory type it cannot handle during an operation.
Q: How can I resolve this issue?
A: Ensure that all parameters and directories involved in the operation are compatible with the current environment and system version. Consult documentation for specific requirements and limitations.
Summary
The ERROR_MRM_UNSUPPORTED_DIRECTORY_TYPE error code signifies that an unsupported directory type was encountered during a file management operation. Developers should review their operations, validate parameters, and ensure compatibility with the system to avoid this issue.