Hi Rathin,
This warning is part of Excel's Trust Center options.
To disable it, you'll need to click: File > Options > Trust Center > Trust Center Settings... > Privacy Options
...and then un-tick the option Remove personal information from file properties on save.
For more on the Trust Center, see the video lesson: Expert Skills Lesson 9-14: Understand Trusted Documents.
I hope this solves your problem. If not, please feel free to reply to this post and I will try to offer further advice.
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