Programatically compare two documents and get list of changes

Hi

Is there any way to compare and retrieve the changes for two word document. I tried different options like the ones mentioned in below link, still I am not getting any way to get the changes for the document in the form of report. 

The Interop WordDocument.Compare method generates the new file with changes however we are looking for only the changes done for the file. Also, the interop compare method always generates the new comaprision file even when there are no changes in the document. Please advice if there is any way to get the list of changes between two word documents (.docx)

http://social.msdn.microsoft.com/forums/en-US/isvvba/thread/ab821d14-bfbc-4c08-b44b-7a5d293ecb2c

http://msdn.microsoft.com/en-us/library/aa302294.aspx

Thanks

Vinod