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// For complete examples and data files, please go to https://github.com/groupdocsviewer/GroupDocs_Viewer_NET
// Create image handler 
ViewerImageHandler imageHandler = new ViewerImageHandler(Utilities.GetConfigurations());

// Guid implies that unique document name 
string guid = DocumentName;

// Get original file
FileContainer container = imageHandler.GetFile(guid);
           
//Save each image at disk
Utilities.SaveAsImage(DocumentName, container.Stream);