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Retrofitting the WM_COPYDATA message onto Windows 3.1

53 · Raymond Chen · June 17, 2026, 3:24 a.m.

Old New Thing [Other] Windows 3.1 WM_COPYDATA legacy systems software development

Summary

This post discusses the process of retrofitting the WM_COPYDATA message onto Windows 3.1, focusing on its design and implications for developers working with legacy systems.

Read full post on devblogs.microsoft.com →

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Retrofitting the WM_COPY­DATA message onto Windows 3.1

Retrofitting the WM_COPYDATA message onto Windows 3.1