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E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME
The scope of E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME is Windows cloud-file and sync-engine infrastructure: a directory component violates the local or remote sync naming contract. Preserve 0x8802D002 beside the returning call before cleanup or retry creates a more generic secondary failure.
Read the boundary first
When E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME is returned, a Windows sync engine coordinates local NTFS objects, provider metadata, remote identifiers, quota and naming rules, placeholder hydration, network authentication, and asynchronous upload or download state. During a E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME investigation, the same Explorer action can cross several of those boundaries, so diagnosis must retain the first failing stage rather than treating every code as a generic connectivity problem.
During a E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME investigation, folder renaming affects every descendant path and remote identity. For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, reserved names, characters, trailing spaces/dots, normalization or service rules should be detected before a large subtree is queued.
For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, the first owner to inspect is the local sync root, placeholder state, file-system operation, provider request, network exchange, account policy, or remote storage operation that produced the HRESULT.
Keep neighboring conditions separate
When E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME is returned, UNSUPPORTED_FILE_NAME affects one file; a folder-name correction can change an entire subtree.
For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, do not sanitize the folder name without collision and descendant analysis.
Incident record for this HRESULT
| Capture | Diagnostic value |
|---|---|
| Exact folder component and Unicode points for E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME. | For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, this provides a stable comparison across retries or another machine and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Descendant count for E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME. | For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, this identifies the exact object or resource generation involved and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Normalized/case-collision state for E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME. | For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, this places the failure on the lifecycle or transaction timeline and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Remote naming rule for E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME. | For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, this separates caller input from environment and service state and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
Reproduce without destroying evidence
For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, the investigation should change one variable at a time and keep the original failing sample.
- First: Validate the single component.
- Next: Preview descendant path effects.
- Then: Rename atomically through the engine.
- Finally: Reconcile remote IDs after the rename.
Three useful controls
- Second supported path for the same stable item: For
E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, keep account, remote item version, and client build fixed. - Reduced failing operation: If
E_SYNCENGINE_UNSUPPORTED_FOLDER_NAMEfollows the reduced step, the rejecting transition is localized. Hold constant: For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, retain exact folder component and unicode points and remove only unrelated work. - Targeted corrective control: Use this as a diagnostic branch rather than a blanket workaround: validate the single component. Hold constant: For E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME, keep the original E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME sample available for the final regression test.
Definition of done
Closure for E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME requires the renamed subtree preserves identity and all descendants remain within naming and path limits; then repeat the next lifecycle operation to detect stale state.
Technical references
The references below define the API family or storage/protocol behavior used to interpret E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME.
- For
E_SYNCENGINE_UNSUPPORTED_FOLDER_NAME: Microsoft: Build a Cloud Files sync engine - Microsoft: Naming files, paths, and namespaces
- Microsoft: Cloud Filter API reference
- Microsoft: Determine cloud placeholder state
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