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Thank you for considering Aspose.
I tried your option and it did not allow me to run and facing the error as unable to open the zip file. I tried with the latest Aspose.Cells download.
Well, we checked your sample application with the latest version attached in my previous post (Aspose.Cells V18.104.22.168) and it works fine without any error. Please make sure you are using the latest version I attached in my previous post (Aspose.Cells V22.214.171.124) and not the official release which you may have downloaded from our download section (Aspose.Cells V126.96.36.199)
Basically I am facing problem with margins in the Excel 2007 file. Before running the utility the margins were good. After running the utility they are getting changed. Attached a word file for explaining the problem once again.
Well, the template file you shared with us does contain the empty columns you are mentioning. Please see the attached screen shot of the print preview of your template file using MS Excel 2007. Please make sure that you sent us the same file which you are using for your testing as you can see that the three empty columns are appearing in your template file’s Excel Print Preview.
Thank You & Best Regards,