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Thread ID: 143513 2017-01-30 10:45:00 Excel format or file extension is not valid ChaMoses (17522) Press F1
Post ID Timestamp Content User
1431397 2017-01-30 10:45:00 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.
ChaMoses (17522)
1431398 2017-01-30 11:04:00 Why happens when you try to open it from within Excel? Cato (6936)
1431399 2017-01-30 13:08:00 The same error ChaMoses (17522)
1431400 2017-01-30 19:01:00 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?
CYaBro (73)
1431401 2017-01-30 19:33:00 What version of office do you have? Isn't xlsx 2010 onwards? psycik (12851)
1431402 2017-01-31 00:07:00 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
Jedsdad (17435)
1431403 2017-01-31 01:39:00 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 ?
1101 (13337)
1431404 2017-01-31 03:43:00 LibreOffice would do the job. Use both OpenOffice and LibreOffice with greater joy than old Excel.

lurking.
Lurking (218)
1431405 2017-01-31 21:39:00 I am using Excel 2007. Only one file cannot be opened.
.docx format files open well in Word. I have no back up file:(
ChaMoses (17522)
1431406 2017-01-31 21:50:00 Did you check for an earlier version as I mentioned above? Jedsdad (17435)
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