Error Code Portal
MicrosoftWindows Win32Error code

1445

ERROR_NON_MDICHILD_WINDOW

Alternative forms: 0x000005A5 · 0x5A5 · ERROR_NON_MDICHILD_WINDOW · 0x800705A5

What does this code mean?

Code 1445 · An issue reported by Windows Win32.

Official explanation · Original text

Cannot process a message from a window that is not a multiple document interface (MDI) window.

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 (1300-1699) (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