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E_SYNCENGINE_PATH_LENGTH_LIMIT_EXCEEDED
Within Windows cloud-file and sync-engine infrastructure, E_SYNCENGINE_PATH_LENGTH_LIMIT_EXCEEDED reports that an existing local file or folder path exceeds the sync engine’s supported path length. Diagnosis of this result should follow the original owner and generation rather than treating the visible symptom as the cause.
Facts that change the diagnosis
- Full canonical path length.
- Each component length.
- Client long-path awareness.
- Remote path limit.
Subsystem meaning
Diagnostic focus: For E_SYNCENGINE_PATH_LENGTH_LIMIT_EXCEEDED, isolate the current local path presented to the sync engine, including the sync-root prefix and normalized component names. Keep the item identity and account fixed while changing only that boundary; a different result after that change shows which stage rejected the operation.
Windows namespace support and sync-service limits are separate. A long-path-aware application may open a path that the sync client or remote service cannot represent.
Isolation workflow
- First: Measure the path in the service’s unit and normalization.
- Next: Shorten high-level folder components.
- Then: Test the longest descendant.
- Finally: Validate before queueing a subtree.
Avoid the tempting broad fix
REMOTE_PATH_LENGTH_LIMIT_EXCEEDED predicts that remote-to-local materialization would exceed the local limit; this code describes the current path.
Do not rely only on the legacy MAX_PATH constant or only on Explorer display length.
Expected branches
| Control | Interpretation | Hold constant |
|---|---|---|
| Same stable item ID, second supported path | A change separates local file-system/provider state from remote service state. | Keep account, remote version and client build fixed. |
Regression proof
Verify it with the original scenario, one boundary case, and one deliberate failure; success means the longest synchronized path stays within both local client and remote service limits.
Technical references
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