Разобрать форматы XLSM в C#

    // extract images from Worksheets 
    // open a template Excel file
    Workbook workbook = new Workbook("sampleExtractImagesFromWorksheets.xlsm");
    
    // get the first worksheet
    Worksheet worksheet = workbook.Worksheets[0];
    
    // get the first Picture in the first worksheet
    Aspose.Cells.Drawing.Picture pic = worksheet.Pictures[0];
    
    // set the output image file path
    string picformat = pic.ImageType.ToString();
                
    // Note: you may evaluate the image format before specifying the image path
    // define ImageOrPrintOptions
    Aspose.Cells.Rendering.ImageOrPrintOptions printoption = new  Aspose.Cells.Rendering.ImageOrPrintOptions();
    
    // specify the image format
    printoption.ImageType =  Aspose.Cells.Drawing.ImageType.Jpeg;
                
    // save the image
    pic.ToImage("outputExtractImagesFromWorksheets.jpg", printoption);