file extension is not valid , verify that the file is not corrupted

adityanagori 

If this does not help and the error only occurs with this file, I recommend following this link with the attached steps.

File formats that are supported in Excel

If this does not help and the problem only occurs in this file,

could you paste the file (without sensitive data) or

Perform repair steps such as...

Repair a corrupted workbook

right after...not only if it didn't work.

Install the latest update

Repair Office programs

Start Office applications in safe mode

Identify possible problems with the add-in

Check if the file was created by a third party

Hope I was able to help you with this info.

NikolinoDE

I know I don't know anything (Socrates)

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