huiyadanli/RevokeMsgPatcher

RevokeMsgPatcher is a hex editor and patcher tool for Windows PC versions of WeChat, QQ, and TIM that prevents message revocation.

The tool solves the problem of messages being deleted or recalled by the sender after delivery. It works by patching the core library files of these messaging applications—specifically WeChatWin.dll for WeChat and IM.dll for QQ and TIM—to disable the revocation mechanism. The patcher operates by modifying the binary code of these libraries to intercept and block message recall commands. For WeChat, the tool additionally offers a multi-instance feature that allows running multiple WeChat clients simultaneously on the same machine.

The tool is designed for Windows 7 and later systems with .NET Framework 4.5.2 or higher. Users must run the patcher with administrator privileges and close their messaging application before applying patches. The patcher attempts to automatically detect installation paths from the Windows registry for standard installations, though portable versions require manual path selection. Because the tool modifies system library files, antivirus software may flag the changes as suspicious, but these warnings can be safely dismissed. The patches must be reapplied whenever the messaging applications receive updates, as new versions will overwrite the modified files.

The project maintains documentation covering supported application versions and common questions. The underlying patching methods are documented separately for each supported application. The codebase is written in C# and builds through continuous integration. Development activity shows ongoing maintenance with patches being updated to accommodate new releases of the target applications.