You will have to use "ODC_xlflatnr.exe" filter from Microsoft Site. Below is the link to download it,
http://download.microsoft.com/download/f/8/9/f89b7be1-eb0a-4a31-947f-b77a7809e33d/odc_xlflatnr.exe
Once you have downloaded it, you will have to use it. For in detail steps on How to do it browse to the below mentioned link,
http://msdn.microsoft.com/en-us/library/aa140055%28office.10%29.aspx
I am sure this will solve your problem.