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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 condition first
Folder renaming affects every descendant path and remote identity. Reserved names, characters, trailing spaces/dots, normalization or service rules should be detected before a large subtree is queued.
Inspect 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
UNSUPPORTED_FILE_NAME affects one file; a folder-name correction can change an entire subtree.
Do not sanitize the folder name without collision and descendant analysis.
Incident record
- Exact folder component and Unicode points.
- Descendant count.
- Normalized/case-collision state.
- Remote naming rule.
Reproduce without destroying evidence
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: a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: keep account, remote item version, and client build fixed.
- Reduced failing operation: If this result follows the reduced step, the rejecting transition is localized. Hold constant: 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: keep the original failing sample available for the final regression test.
Definition of done
Closure 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 this result.
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