excel found unreadable content in (Xlsx)

7 posts, 0 answers
  1. Kurt Kluth
    Kurt Kluth avatar
    171 posts
    Member since:
    Oct 2009

    Posted 20 Nov 2014 Link to this post

    We have the latest version of Telerik ASP.net tools that allows the exporting to Xlsx from a RadGrid. 

    We are receiving the following error when we go to export the data:

    excel found unreadable content in <filename>.xlsx, do you want to recover the contents of the workbook?

    I would like to mention that it doesn't give it to us all the time, only on select downloads and I am unable to determine what it had to repair. 

    Any suggestions?
  2. Maria Ilieva
    Maria Ilieva avatar
    4017 posts

    Posted 25 Nov 2014 Link to this post

    Hi Kurt,

    The presented error actually is a security issue.
    You can revise the thread below for more information on this matter and possible solution for its fixing:

    Maria Ilieva

    Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.

  3. Alva
    Alva avatar
    1 posts
    Member since:
    Jul 2016

    Posted 19 Jul 2016 Link to this post

    1. Navigate to the folder containing the XLSX file you want to repair.
    2. Right-click the file and select "Copy" and then right-click on a
    blank space within the folder and select "Paste." This action generates a
    backup copy of the corrupted file.
    3. Open Microsoft Excel 2007 or later.
    4. Click the "Office" button in the top left corner of the window and select "Open."
    5. Navigate to the folder containing the copy of the XLSX file you
    generated previously and select it by single-clicking its icon.
    6. Click the arrow located to the right of the "Open" button and select "Open and Repair."
    7. Select "Repair." If you previously attempted this method and the
    process failed, try to extract only the values and formulas by selecting
    "Extract Data" instead. Regardless of the method you choose, your data
    will appear on the screen within a few seconds if the process completes

    For more visit: http://www.repairmsexcel.com/blog/how-to-resolve-excel-found-unreadable-content-in-filename-xls-error-in-ms-excel

  4. Maria Ilieva
    Maria Ilieva avatar
    4017 posts

    Posted 21 Jul 2016 Link to this post

    Hello Alva,

    Thank you for the provided information.

    I'm sure it will be of a big help for other users that are facing the problem discussed ion this thread.

    Maria Ilieva
    Telerik by Progress
    Do you need help with upgrading your ASP.NET AJAX, WPF or WinForms projects? Check the Telerik API Analyzer and share your thoughts.
  5. Edward
    Edward avatar
    10 posts
    Member since:
    Jan 2017

    Posted 17 Jan 2017 Link to this post

    Receiving ‘Excel found unreadable content in filename.xls’ in your excel workbook but unable to fix this error? Well you can fix this by trying manual as well as automatic solution. For manual solution you must try these steps:

    Firstly you need to change the File Extension of Your Excel Sheet. Sometimes, the problem is occurred due to the unsupported file extension of your excel file. To check the support of xlsx extension, go to the ‘My Computer’. Browse ‘Tools >> Folder Options >> File Types’. Make sure that the ‘xlsx’ extension is included there or not. If not then rename this file and change ‘.xlsx’ to ‘.xls’.
    Use Open and Repair option of excel:
    For this, just open the Excel workbook and then go to ‘File >> Open option. Choose the file which you want to open but don’t make double tap on it. After then go to the ‘Open’ dialog box and then select ‘Open and Repair’ option from there. This process will fix the corrupt excel spread sheet and open it normally.
    The chances are very less for the perfect conversion, but yes your damaged file could be recovered of course for sure.


  6. Casey
    Casey avatar
    4 posts
    Member since:
    Mar 2017

    Posted 24 Aug 2017 Link to this post

    This work around is great and all, but can you please tell me why this is doing this, and is there an actual fix coming down the pipe beyond using a work around? Strange that everyone of my customers will be seeing these messages.



  7. Eyup
    Eyup avatar
    4079 posts

    Posted 29 Aug 2017 Link to this post

    Hi Casey,

    I am afraid there are currently no plans to change the Exporting behavior of RadGrid.

    Progress Telerik
    Try our brand new, jQuery-free Angular 2 components built from ground-up which deliver the business app essential building blocks - a grid component, data visualization (charts) and form elements.
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