So what I'm trying todo is get these pictures and put them into the string builder.
StringBuilder sb = new StringBuilder();
Spire.Xls.Workbook workbook = new Spire.Xls.Workbook();
workbook.LoadFromFile(Path.Combine(path, file));
Spire.Xls.Worksheet sheet = workbook.Worksheets[0];
Spire.Xls.Collections.PicturesCollection pictures = sheet.Pictures;
for (i = 0; i < pictures.Count; i++)
{
sb.Append(@"<img src="+pictures[i]+ " />");
}