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STATUS_UNSUPPORTED_COMPRESSION
The file system or decoder does not support this compression format
Windows exposes multiple compression identifiers, but support depends on the API, file system, OS version, and operation. A format valid for one system component is not automatically valid for per-file NTFS compression or for another volume type.
Query capabilities and the current compression state rather than hard-coding an algorithm. Re-encoding may be required when moving data across a file-system or protocol boundary.
What to inspect
- Record the exact COMPRESSION_FORMAT value and control code.
- Query the destination volume’s file-system flags and current file compression state.
- Use a supported format or store the data uncompressed; do not relabel encoded bytes as another format.
References
- Microsoft: FSCTL_SET_COMPRESSION
- Microsoft: FSCTL_GET_COMPRESSION
- Microsoft: File Compression and Decompression
- NTFS-3G: transparently compressed NTFS files
- Microsoft Open Specifications: NTSTATUS values
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