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    I see no mention of your error in the xcopy docs, but it suggests to me that it's warning you that you're trying to change a file's extension. Try not doing that (copying to a new .xlsx file) and see whether you get the error. If that is the cause of the error, and you deliberately want to change the extension, there is no cause for concern, you can safely ignore the error. Windows always gets very alarmed when someone changes a file extension.
    – ComputerUser121212
    Commented Jan 23 at 21:30
  • well when my program tries to open this (DMX) it says there is an error. Because it is not able to read the file. Which tells me that although this is a warning for a human to open the file, the program does not know this and is not able to open it. So, I am looking for a solution that can convert the excel file to a csv file without getting this warning.
    – Sevanna
    Commented Jan 24 at 17:58