Excel file extinction is not valid on Windows File Server 2008

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  You've asked in windows server forums that support the operating system itself. Try copying the files local and if problems persist I'd suggest reaching out to subject matter experts in dedicated forums here.

  https://answers.microsoft.com/en-us/msoffice/forum/msoffice_excel
  https://social.technet.microsoft.com/Forums/office/en-US/home?forum=excel
  https://social.msdn.microsoft.com/Forums/Lync/en-US/home?forum=exceldev

   

   

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  Regards, Dave Patrick ....
  Microsoft Certified Professional
  Microsoft MVP [Windows Server] Datacenter Management
  
  Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.
  

  
  
  

  • Edited by Dave PatrickMVP Saturday, July 11, 2020 4:26 PM

  Saturday, July 11, 2020 4:01 PM
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  Thank you for your help

  I believe it needs hotfix or update to be installed on the server.

  Sunday, July 12, 2020 6:19 AM
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  You can verify system and servicing health by running;

  sfc /scannow

  also system update readiness tool

  https://support.microsoft.com/en-us/kb/947821

  Then check for errors in;
  %SYSTEMROOT%\Logs\CBS\CheckSUR.log

   then when all is good find the latest (non-ESU) cumulative updates here.

  https://support.microsoft.com/en-us/help/4009469/windows-7-sp1-windows-server-2008-r2-sp1-update-history

   

   (please don't forget to mark helpful replies as answer)

   

   

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  Regards, Dave Patrick ....
  Microsoft Certified Professional
  Microsoft MVP [Windows Server] Datacenter Management
  
  Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.
  

  
  
  

  • Edited by Dave PatrickMVP Sunday, July 12, 2020 4:47 PM

  Sunday, July 12, 2020 11:59 AM
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  HI
  There are 2 documents for your reference.
  
  A file is in a different format than its extension indicates in Excel
  https://support.microsoft.com/en-us/office/a-file-is-in-a-different-format-than-its-extension-indicates-in-excel-0d2dfb3f-b5a9-4a71-9712-0084672921a7

  [Fixed] Excel Cannot Open the File Because the File Format or File Extension Is Not Valid

  https://www.easeus.com/file-recovery/excel-cannot-open-the-file.html

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  Andy YOU
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  Monday, July 13, 2020 3:18 PM
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  HI
  Is there any progress on your question?

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  Best Regards
  Andy YOU
  Please remember to mark the replies as answers if they help.
  If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

  Thursday, August 6, 2020 6:21 AM
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  Hi,

  We have Windows File Server 2008 R2 and shared to the end users, It has many files (Excel, Words and PDF's),

  Server hanged and all users got this error (Excel cannot open the file because the file format or file extinction is not valid) only for the files were open, And all old files are fine,

  We tried to repair online tools, Excel recovery/fix tools /application, And with the excel repair option, Checked the unsaved files with no luck,

  Anyone can help us on this please.

  Thank You

  As Dave suggests try to copy the file and test it locally or in a different PCs.

  I think you can also go to command line and check whether the file extension is correct like ".xls" or ".xlsx" if it is something else then it could be other issue.

  Do you have an anti-virus on the server? and make sure the server is updated.

  Malware or other potentially unwanted software or applications, can create this issue, they change or encrypt the file and users are unable to open.

  Good luck!!!

   

   

   

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  Every second counts..make use of it. Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.

  
  

  • Edited by cguan Thursday, August 6, 2020 8:38 AM edit

  Thursday, August 6, 2020 8:37 AM