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Windows Imaging Component wrapper around libwebp for WebP support. Currently, only decoding is supported, but that allows to e.g., see the files in Windows PhotoViewer. Directories: example - an example webp file. setup - WiX scripts to create MSI packages and a wrapper setup. src - source code of the WIC interfaces. test - tests comparing the WebP codec with the builtin Jpeg codec. Directories created after a build bin - place where generated DLLs, MSIs etc will be put. ipch - precompiled headers by Visual Studio. obj - place where generated object files etc, will be put. The solution/project were created in Visual Studio 2010, I don't know if they work with older versions. It requires Windows SDK 7.1 - the projects its compiler, as the compiler in Visual C++ Express doesn't support x64. The tests loads the decoder using CoCreateInstance - i.e. they choose the DLL that is currently registered in the system registry - they don't automatically choose the DLL from the active configuration. To register a DLL. Run from an elevated command prompt (elevated command prompt = choose command prompt icon, right click and choose 'Run As Administrator') e.g.: regsvr32 bin\x64\Debug\WebpWICCodec.dll Note that the registry has different branches for 32-bit and 64-bit COM object registrations, thus, you register independently a win32 and x64 DLL. On the other hand registering e.g. a release DLL when a debug DLL for the same architecture was previously registered should overwrite the previous registration. If you want to unregister a DLL, run e.g.: regsvr32 /u bin\x64\Debug\WebpWICCodec.dll The tests were written on Windows 7. Some of them may fail e.g., on Vista. The setup consists of a x86 MSI package (with the x64 DLL), x64 MSI package (with both DLLs) and a wrapper EXE that chooses the correct one. The MSIs are created with WiX 3.0. Typing 'msbuild' should create both packages and the wrapper.