Windows error 618 (ERROR_UNSUPPORTED

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: the requested compression format is not implemented by the current component.

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ERROR_PWD_HISTORY_CONFLICT	ERROR_INVALID_HW_PROFILE

ERROR_UNSUPPORTED_COMPRESSION

The selected compression format is not supported in this path

Windows exposes several compression mechanisms: transparent file-system compression, the Compression API, cabinet formats, and protocol-specific algorithms. A format identifier valid for one API is not automatically accepted by another. This error means the current file system, library, driver, or protocol endpoint does not implement the requested format.

Record which API received the request and the exact algorithm or compression-state value supplied. For FSCTL_SET_COMPRESSION, only predefined file-system compression states are valid and support is optional for an object store. For application compression, create the compressor and decompressor with matching algorithms. Negotiated network compression should fall back only to a format supported by both endpoints.

What to inspect

Identify the API and compression format namespace in use.
Confirm both producer and consumer support the same algorithm.
Use an explicit uncompressed fallback when the contract permits it.

References

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