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Why are Office files modified by SharePoint automatically?

Posted By:      Posted Date: April 14, 2011    Points: 0   Category :C#

Hi ,

I noticed that all the Office files (including word, excel, ppt ) will have tiny changes after they are uploaded into SharePoint.

I means if I have 10 files with the excactly same content but different file name, then upload all the ten files into a sharepoint doc lib. After that, download the ten file back to a local folder, compare the content of the ten file by some binary compare tool like "beyond compare" , then I notice that the content of the 10 files are no longer the same.

Does there someone know why this happens, is there some online document talking about this, and is it configurable? Anyone have any idea?


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