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WU_E_PT_ECP_FAILURE_TO_DECOMPRESS_CAB_FILE
WU_E_PT_ECP_FAILURE_TO_DECOMPRESS_CAB_FILE means the CAB file could not be decompressed. Common evidence to review includes an incomplete transfer, content corruption, or a stale cache serving an invalid file.
What to check
- Identify the CAB file and its source from WindowsUpdate.log.
- Check whether the same content fails for multiple clients, which points toward WSUS, a proxy cache, or the content distribution path.
- Reacquire the CAB from the trusted source rather than manually extracting and replacing individual files.
Microsoft: Troubleshoot WSUS synchronization and import issues
Microsoft: Windows Update log files
Microsoft: Windows Update error reference
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