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// For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-Java
try {
	// Setup GroupDocs.Viewer config
	ViewerConfig config = Utilities.getConfiguration();
	// Create image handler
	ViewerImageHandler imageHandler = new ViewerImageHandler(config);

	String guid = fileName;

	// Get file in container
	FileContainer container = imageHandler.getFile(guid);

	// Save file
	Utilities.saveAsFile(fileName, container.getStream());

} catch (Exception exp) {
	System.out.println("Exception: " + exp.getMessage());
	exp.printStackTrace();
}