![]() If images in your image format already exist on the computer, the thumbnail cache will contain default thumbnails for them because no decoder was available to extract the thumbnails when the images were first acquired. This call notifies Windows that new file association information is available. ![]() SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, NULL, NULL) When a codec is installed, the installer needs to call the following function after writing its registry entries. Integration with Windows Photo Gallery and Windows Explorer Updating the Thumbnail Cache When Installing Your Codec ![]() The following topics describe the registry entries you need to register your codec: You also need to make registry entries to register your container format with the metadata handlers for the metadata formats that your image format supports. When you register a codec, you are actually registering two components: the encoder and the decoder. Making Your WIC-Enabled Codec Available To Users.Updating the Thumbnail Cache When Installing Your Codec.This topic contains the following sections: ![]() You must also make sure the thumbnail cache gets updated in case any images in your format already exist on the computer. When you install a codec, you must register it in the registry.
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