ApiViewer 2004ApiViewer 2004 
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ApiViewer 2004 (ApiViewer2004.exe). If you have a lot with the Windows API, you might have noticed that the win32api.txt shipped with VB is totally outdated.
Modern, Fast, and Complete API Reference Tool for Windows Developers
ApiViewer 2004 replaces the outdated Microsoft API Viewer and gives Windows developers instant access to a fully updated Win32 API database. Built from the latest Windows XP header files, it removes the hassle of searching online and wasting time on incomplete or scattered documentation. This tool is designed for productivity, stability, and fast lookups—perfect for developers, hobbyists, and anyone working with low-level Windows programming.
Compared to the old win32api.txt from VB (Windows 95 era), ApiViewer 2004 delivers a massive library of accurate prototypes, constants, and definitions. With more than 6,500 functions and over 55,000 constants included, it eliminates overflow errors, version mismatches, and missing entries. Whether you're building utilities, debugging system calls, or exploring Windows internals, ApiViewer 2004 provides a reliable reference for every project, enriched with practical developer keywords like “Windows API reference tool,” “programming productivity utility,” and “developer documentation extender.”