Error Code Portal
MicrosoftWindows Win32Error code

558

ERROR_UNEXPECTED_MM_EXTEND_ERR

Alternative forms: 0x0000022E · 0x22E · ERROR_UNEXPECTED_MM_EXTEND_ERR · 0x8007022E

What does this code mean?

Code 558 · An issue reported by Windows Win32.

Official explanation · Original text

If an MM error is returned which is not defined in the standard FsRtl filter, it is converted to one of the following errors which is guaranteed to be in the filter. In this case information is lost, however, the filter correctly handles the exception.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

System Error Codes (500-999) (WinError.h) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

Source details · Original licenses and notices