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// For complete examples and data files, please go to https://github.com/groupdocs-conversion/GroupDocs.Conversion-for-Java
// Instantiating the conversion handler
ConversionHandler conversionHandler = new ConversionHandler(Utilities.getConfiguration());
// Set password to unprotect protected document during loading
LoadOptions loadOptions = new LoadOptions();
loadOptions.setPassword("secret");

// Convert file to Ppt, starting from page 2 and convert 2 pages,
SaveOptions saveOptions = new SlidesSaveOptions();
saveOptions.setPageNumber(2);
saveOptions.setNumPagesToConvert(2);
saveOptions.setConvertFileType(SlidesSaveOptions.SlidesFileType.Ppt);
saveOptions.setOutputType(OutputType.String);

String convertedDocumentPath = conversionHandler.<String> convert(fileName, loadOptions, saveOptions);