Error "file format or file extension is not valid" when open excel file

Question

I am having problems opening excel files. Error "file format or file extension is not valid". I edited this file using microsoft office 2019 pro plus preview version on another computer, then saved it to the hard drive to bring to my computer. But on my computer there is the above error, now I don't know how to fix that error, because the data in it is very important to me. Thanks everyone!
P/s: I have tried to change the extension from .xlsx to .xls or .csv, but it still not working.

Answer 1

Hello Thăng Nhật,  Welcome to the Microsoft Community.The file formats supported by different versions of Office may vary, what version of Office is on your computer?Please send us a screenshot of the Office product you are using on your computer via the link below.About Office: What version of Office am I using? - Microsoft SupportCan you please tell me if all files created using office 2019 pro plus have the same problem?Can you please create an Excel file using office 2019 pro plus without any editing, save it and move it to your computer and see if the same problem occurs.Please also create an Excel file on your computer and see if it opens properly.SincerelyCarlos - MSFT | Microsoft Community Support Specialist

Answer 2

I am having problems opening excel files. Error "file format or file extension is not valid". I edited this file using microsoft office 2019 pro plus preview version on another computer, then saved it to the hard drive to bring to my computer. But on my computer there is the above error, now I don't know how to fix that error, because the data in it is very important to me. Thanks everyone!
P/s: I have tried to change the extension from .xlsx to .xls or .csv, but it still not working.

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