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  1. #1
    Junior Member
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    Default Excel format or file extension is not valid

    Hi all!
    Please help me to solve my problem. All of a sudden when I try to open .xlsx format*I get an error message that excel cannot open the file because the file format or file extension is not valid and when I click OK the message closes without opening the program. How to open or repair .xlsx file?

    Thank for any help you can provide.

  2. #2
    Evil Super Villain Cato's Avatar
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    Default Re: Excel format or file extension is not valid

    Why happens when you try to open it from within Excel?
    Who was the first that forged the deadly blade?
    Of rugged steel his savage soul was made.

  3. #3
    Junior Member
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    Default Re: Excel format or file extension is not valid

    The same error

  4. #4
    Computer Tech
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    Default Re: Excel format or file extension is not valid

    Is it just one file that does this or all of them?
    What about other file types like .docx? Do they open ok in Word?

  5. #5
    Senior Member
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    Default Re: Excel format or file extension is not valid

    What version of office do you have? Isn't xlsx 2010 onwards?
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  6. #6

    Default Re: Excel format or file extension is not valid

    Excel 2007 also uses .xlxs.
    What you could try is to find an earlier version of the file as the current one may be corrupted.
    Using Windows Explorer find the file you are trying to open.
    Right Click on the File and select Properties
    Select the "Previous Versions" tab and see if it finds an earlier version.
    If so you should be able to select the previous version then restore it.
    Hopefully then you will be able to open the file albeit may have some missing info as it is an earlier version

  7. #7
    Senior Member 1101's Avatar
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    Default Re: Excel format or file extension is not valid

    restore that file from backup, which of course you have

    anyway, too little info given to diag the issue .
    We still dont know if its just the one file, all xlsx files, dont know if that file ever worked

    need....more....data.....please....

    2003 also opens xlsx , if you run the patch from MS .

    sniff sniff, have we been setup by a spammer ?

  8. #8
    Senior Member
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    Default Re: Excel format or file extension is not valid

    LibreOffice would do the job. Use both OpenOffice and LibreOffice with greater joy than old Excel.

    lurking.

  9. #9
    Junior Member
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    Default Re: Excel format or file extension is not valid

    I am using Excel 2007. Only one file cannot be opened.
    .docx format files open well in Word. I have no back up file

  10. #10

    Default Re: Excel format or file extension is not valid

    Did you check for an earlier version as I mentioned above?

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