Forum Thread

Excel spreadsheet gets error "Excel cannot open the file .xlsx.." How can I "uncorrupt" this file

johnrch06789 1 10 October 26, 2015 at 08:43 AM
Hi,

After a power outage a particularly important file gets the error "Excel cannot open the file.xlsx beacause the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file. The file format has not changed. Is there a safe free program that can uncorrupt a file? I have tried Open and repair, changing the format, and using open office. Also tried using recova but the file was not lost.

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#2
Quote from johnrch06789 View Post :
After a power outage a particularly important file gets the error "Excel cannot open the file.xlsx beacause the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file. The file format has not changed. Is there a safe free program that can uncorrupt a file? I have tried Open and repair, changing the format, and using open office. Also tried using recova but the file was not lost.
There are some tips including places to look for tmp files here:
http://office-recovery.com/excel.asp


Quote from YanksIn2009 View Post :
There are a number of products that claim to help with this. For ex:

https://www.datanumen.com/excel-repair/

No idea how good they are as I personally have never used any of them so caveat emptor.

The bottom line and lessons you should learn from this are:
1. backup your data regularly.
2. Install and maintain good internet security software and do not go to suspicious sites.
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#3
You might want to consider getting a UPS for backup power.
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