ERROR_UNSUPPORTED_COMPRESSION 0x8007026A

Error code 618 · HRESULT 0x8007026A

WINDOWS

The specified compression format is unsupported.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_UNSUPPORTED_COMPRESSION is a Windows error code (system error 618, returned as HRESULT 0x8007026A) reported by Windows. Its official message is: “The specified compression format is unsupported.”

How to fix ERROR_UNSUPPORTED_COMPRESSION

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_UNSUPPORTED_TYPEERROR_PWD_HISTORY_CONFLICTERROR_INVALID_HW_PROFILEERROR_PWD_TOO_RECENTERROR_GEN_FAILUREERROR_SHARING_VIOLATIONERROR_BAD_NETPATHERROR_BAD_NET_NAME

Source: Microsoft WinError.h

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