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SPAPI_E_FILEQUEUE_LOCKED
SPAPI_E_FILEQUEUE_LOCKED means that SetupAPI cannot modify a file queue while the queue is locked by a current operation. File queues represent pending copy, delete, or rename work; changing them during processing would invalidate the state visible to callbacks and installers.
What to check
- Finish or cancel the current queue commit before enqueueing additional file operations.
- Keep file-queue callbacks from re-entering code that changes the same queue.
- Create a separate queue when independent installation phases need to be built concurrently.
Microsoft: SetupAPI file and installation functions
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