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// Setup GroupDocs.Viewer config
ViewerConfig config = Utilities.GetConfigurations();
 
// Create image or html handler
ViewerImageHandler imageHandler = new ViewerImageHandler(config);
 
// Get supported document formats
DocumentFormatsContainer documentFormatsContainer = imageHandler.GetSupportedDocumentFormats();
Dictionary<string, string> supportedDocumentFormats = documentFormatsContainer.SupportedDocumentFormats;
 
foreach (KeyValuePair<string, string> supportedDocumentFormat in supportedDocumentFormats)
{
    Console.WriteLine(string.Format("Extension: '{0}'; Document format: '{1}'", supportedDocumentFormat.Key, supportedDocumentFormat.Value));
}