Verify that the file has not been corrupted

Microsoft Office will then start to check the Excel document and repair problems or corruption it found. Some users have reported that they couldn't open Excel files on Mac. They also receive this error - Excel cannot open the file because the file format or file extension is not valid.

If you are faced with this error, you are unable to view or edit your Excel file. Follow the solutions below, and you can troubleshoot the Office problems. If your unsaved Excel file cannot be opened because the file format or file extension is not valid, how would you recover unsaved Excel files? In this case, try the two ways below.

This method only restores lost files to a previous version. It means that you might lose some changes you may have made to the document. Open the "Previous Version" tab to list all the previously stored versions of the Excel file. Choose the most recent version and click "Restore" to retrieve the spreadsheet. This method only works if you have turned on the AutoSave feature in Microsoft Excel. This feature is also helpful for recovering unsaved Word documents. Beside Manage Versions, you'll see all autosaved versions of your file.

There are many ways to prevent data loss. If you have lost important Excel files due to accidental deletion, hard drive formatting, or virus attacks, you can use the data recovery tool to retrieve lost data. Another crucial point to avoid data loss is backing up your Excel file on a regular basis. In these cases, you have to resort to a professional file recovery tool for help.

And, EaseUS file recovery software is worth trying. Choose the drive X: or a specific folder on Desktop or somewhere else where you lost the excel files, and then click "Scan". To quickly find the Excel files from the scan results, click on the "Filter" on the top area, choose "Excel", and click tree view on the left side.

Or, search. You can double click on the Excel file to preview its integrity. Finally, select the desired Excel files and click "Recover". If you modify and change your worksheet frequently, turning on the AutoSave feature is a good idea. If the problem still persists, it could be due to an incorrect registry entry for the preview handler. Note that it is important to back up the entire registry before any deletion or modification.

Click to know more about different types of Outlook problems and solutions. If the PST file is corrupted and you are unable to access any information, you can repair the file using Remo Repair Outlook software.

One of the best things about the software is its non-destructive mechanism. The software reads the file, extracts contents from the file and then creates a new healthy file by fixing all the issues. If you accidentally deleted a folder on Outlook and looking for ways to recover it, Remo Repair Outlook has the best solution. The PST recovery tool works on password protected and compressed files as well. Only one part is expected.

A file corruption warning as shown in Excel The first tell-tale sign would be a warning from AutoRecover, if it is enabled. Besides corruption, an AutoRecover error may occur due to any disk write error, so your next step should be to save your active workbook. Unfortunately, a corrupted workbook loaded in memory cannot be saved intact. Excel may warn you that: "An unexpected error has occured.

Autorecover has been disabled for this session of Excel. Microsoft Excel may be able to save the file by removing or repairing some features.. To make repairs in a new file, click continue.

A corrupted workbook cannot be saved automatically, so AutoRecover has been disabled in Excel Excel corruption warnings, while user tries to save an open workbook. Even, if just a single image is to blame, Office will remove all images from the customUI part and reset relationships to default.

So you may get taken by surprise when you discover that all images stored inside your workbook have disappeared without a hint! Your workbook may be partially or entirely recovered, based on your AutoRecover settings, assuming it has been enabled.

We have witnessed client workbooks crashing randomly. Needless to say, that NOT all Excel workbooks crash due to file corruption. Some could crash due to Excel bugs in combination with VBA code that doesn't follow best development practices. But when I opened it, same problem occurred. Please help me look for some solution to my problem. Hoping to hear from you soon. Go To Solution. Best Answer. Verify that the file is not corrupted Erwin, You may try the following method to resolve the issue: Click Start, and open the Run Command window.

For more info : When you open a file in Excel , you receive a warning that the file format differs from the format that the file name extension specifies It is always advisable to back up the registry while modifying the registry. Please visit the following web link for more information: How to back up and restore the registry in Windows XP Cheers. About Orabel. Questions 1. Answers 3.