// Setup GroupDocs.Viewer config
ViewerConfig config = Utilities.GetConfigurations();
//Initialize viewer handler
ViewerImageHandler viewerImageHandler = new ViewerImageHandler(viewerConfig);
//Set encoding
Encoding encoding = Encoding.GetEncoding("shift-jis");
//Set image options
ImageOptions imageOptions = new ImageOptions();
imageOptions.WordsOptions.Encoding = encoding;
//Get words document pages with encoding
string wordsDocumentGuid = "document.txt";
List<PageImage> wordsDocumentPages = viewerImageHandler.GetPages(wordsDocumentGuid, imageOptions);
//Get words document info with encoding
DocumentInfoOptions wordsDocumentInfoOptions = new DocumentInfoOptions(wordsDocumentGuid);
wordsDocumentInfoOptions.WordsDocumentInfoOptions.Encoding = encoding;
DocumentInfoContainer wordsDocumentInfoContainer = viewerImageHandler.GetDocumentInfo(wordsDocumentInfoOptions);