Update ExcelBinaryReader.cs
Update ExcelBinaryReader.cs

Adding MSO Drawing check which looks to be what Open Office and Libre Office use with XLS files
wizardgsz/ExcelDataReader,jbendson/ExcelDataReader,Xciles/ExcelDataReader,jbendson/ExcelDataReader,appel1/ExcelDataReader,thriolsson/ExcelDataReader,vassav/ExcelDataReader,vassav/ExcelDataReader,Convey-Compliance/ExcelDataReader,foufure/ExcelDataReader,ExcelDataReader/ExcelDataReader,wizardgsz/ExcelDataReader,java02014/ExcelDataReader,thriolsson/ExcelDataReader,Xciles/ExcelDataReader,jbendson/ExcelDataReader,Convey-Compliance/ExcelDataReader,java02014/ExcelDataReader,foufure/ExcelDataReader