Lỗi excel cannot open the file because the file format or file extension is not valid

Do you get an error message: Excel cannot xuất hiện the file .xlsx because the tệp tin format or tệp tin extension is not valid? Quick fixes và advanced solutions are offered here to lớn help you fix this error on Microsoft Office 2007, 2010, 2013, or 2016. Besides, if you lost Excel files, you can download ucozfree.com data recovery software lớn get additional help.

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The file format of an Excel worksheet is .xlsx or .xls. Whenever the user opens any file, it is opened with the same extension. However, some users may encounter an error when trying to open or edit an Excel tệp tin in Office 2003, 2007, 2010, 2013, 2016, 2019, & 365. The error message displayed reads "Excel cannot open the tệp tin because the extension is not valid".

This article will provide you with comprehensive solutions lớn resolve the "Excel cannot open the file because the file format or file extension is not valid" error. You can change the file extension, use the Office repair utility, or use one of the best tệp tin repair software khổng lồ repair Excel files. 


Workable SolutionsStep-by-step Troubleshooting
Fix Excel Cannot mở cửa the tệp tin on Windows 10Use a file repair tool, change the Excel file extension, or use the mở cửa and Repair tool to troubleshoot...
Fix Excel Cannot xuất hiện The tệp tin Because the Extension Is Not Valid on MacRestart the Excel application as well as Mac or Change the Excel file format on Mac to lớn resolve the problem...
Recover Excel Files Cannot open the FileRestore unsaved Excel Wordbook from previous versions or restore unsaved Excel tệp tin using AutoRecover...

Excel Cannot mở cửa The tệp tin Issue Overview

Sometimes, when you try to mở cửa or edit an Excel file in Microsoft Office 2003, 2007, 2010, 2013, 2016, 2019, or 365, you may encounter the following problem:

"Excel cannot mở cửa the file "filename.xlsx" because the file format or file extension is not valid. Verify that the tệp tin has not been corrupted and that the file extension matches the format of the file."

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It usually indicates the file is not compatible with the Excel version of the tệp tin that has come corrupt or damaged. Here, we will show you all the possible solutions, and you can try these until your issue is fixed. Before you follow the solutions, kiểm tra if Excel is working normally.

Step 1. Press Windows+R keys, type excel.exe /safe, and click "OK". Loading Excel without templates và add-ins allows you lớn see if the program works as it should or if it is corrupted.

Step 2. If Excel opens normally, check for any add-ins that are causing problems in Excel. Disable the add-ins & click on the "OK" button. Then, restart Excel to check if the problem is fixed. If not, move on lớn the fixes below.

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We have full solutions khổng lồ help you solve Excel cannot open the file because the extension is not valid issue in this post. In the beginning, you can watch a đoạn phim tutorial khổng lồ troubleshoot. The key moments in this clip are as follows:

00:26 Ensure you have enough permissions01:03 Enable Safe Mode01:26 open Excel in Safe Mode01:43 Repair & recover the Excel

How lớn Fix Excel Cannot open the tệp tin Because the Extension Is Not Valid on Windows 10/8/7

There are three useful solutions in total here khổng lồ solve the Excel cannot open file problem. 

Fix 1. Use ucozfree.com tệp tin Repair Tool

If the "Excel cannot mở cửa the file because the extension is not valid" problem is caused by tệp tin corruption và not by file compatibility, you need a professional file repair program khổng lồ help you fix the problem. 

ucozfree.com Data Recovery Wizard is an all-in-one tool that can help recover deleted files and repair corrupt files easily and efficiently.


ucozfree.com Excel Data Recovery/Repair Tool

Repair single or multiple Excel files without quantity limitSupport MS Excel 2019, 2016, 2013, 2010, 2007, 2003, XP, 2000, 97, and 95 versionsSupport other document repairs lượt thích Word & PDF
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Fix 2. Change the Excel file Extension to Fix Excel Cannot open the File

Many times, this error occurs due khổng lồ the incompatible file extension of the Excel file. MS Excel saves Excel workbooks as XLSX or XLS files by default. Excel 2003 and earlier versions save files as XLS, whereas Excel 2007 và later versions like Excel 2010, Excel 2013, Excel 2016, & 2019 save files in XLSX tệp tin format. You can change the mặc định file format for the corresponding Excel version to any other tệp tin format supported by MS Excel.

Step 1. mở cửa Microsoft Excel and go to the "File" tab.

Step 2. Click "Export" and choose "Change file Type".

Step 3. Change the file extension lớn any other file format that MS Excel supports and click "Save As" (Excel not saving changes? Quick tips are here). Then, kiểm tra whether Excel can mở cửa your tệp tin or not. 

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Fix 3. Mở cửa Excel tệp tin Using the mở cửa and Repair Feature

The "Open and Repair" is a built-in easy-to-use MS Excel utility that allows you lớn correct the "Excel cannot mở cửa the file because the file format or file extension is not valid" error.

Step 1. Start Office Excel. On the File menu or the Microsoft Office button, click "Open".

Step 2. In the Open dialog box, click khổng lồ select the inaccessible Excel file.

Step 3. Click the down arrow on the xuất hiện button, & then click "Open & Repair". Microsoft Office will then start to check the Excel document and repair problems or corruption it found. 

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How khổng lồ Fix Excel Cannot open the file Because the tệp tin Format or file Extension Is Not Valid on Mac

Some users have reported that they couldn"t xuất hiện Excel files on Mac. They also receive this error - Excel cannot mở cửa the tệp tin because the file format or tệp tin extension is not valid. If you are faced with this error, you are unable lớn view or edit your Excel file. Follow the solutions below, and you can troubleshoot the Office problems.

Fix 1. Restart Excel on Mac

Step 1. Quit the Excel application: click "Excel > Quit Excel".

Step 2. Try to xuất hiện your Excel file on Mac again.

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Fix 2. Restart Mac

Go lớn the "Apple menu > restart".

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Fix 3. Change Excel file Format on Mac

Step 1. Click "File" from the menu bar.

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Step 2. In the "Export To" pop-out menu, pick "Excel".

Step 3. To adjust the tệp tin format between XLSX và XLS, click "Advanced Options" và choose the one you want.

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How lớn Recover Excel file When the file Format or file Extension Is Not Valid

If your unsaved Excel file cannot be opened because the tệp tin format or file extension is not valid, how would you recover unsaved Excel files? In this case, try the two ways below. 

1. Restore Unsaved Excel Wordbook from Previous Versions

This method only restores lost files to a previous version. It means that you might thảm bại some changes you may have made to the document.

Step 1. Right-click the inaccessible Excel file and choose "Properties".

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Step 2. xuất hiện the "Previous Version" tab to danh mục all the previously stored versions of the Excel file.

Step 3. Choose the most recent version và click "Restore" to retrieve the spreadsheet.

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2. Restore Unsaved Excel tệp tin Using AutoRecover

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. 

Step 1. xuất hiện Office Excel & head into the "File" tab > click "Info".

Step 2. Besides Manage Versions, you"ll see all autosaved versions of your file.

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Step 3. Open the tệp tin in Excel and click "Restore". 

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Step 4. Save the file with a new file name & set the extension as .xlsx.

Important Tips: How to lớn Prevent Excel Files from Getting Loss

There are many ways khổng lồ prevent data loss. If you have lost important Excel files due to lớn accidental deletion, hard drive formatting, or virut attacks, you can use the ucozfree.com Data Recovery Wizard tool to lớn retrieve lost data. Another crucial point lớn avoid data loss is backing up your Excel tệp tin on a regular basis.

1. Recover Deleted or Lost Excel Files with tệp tin Recovery Software

In addition to restoring unsaved Excel caused by Excel crashes when saving or other reasons, many users may want to lớn recover lost excel spreadsheets caused by accidental deletion, OS crash, hard drive damage/corruption, or lost partition. In these cases, you have khổng lồ resort to a professional tệp tin recovery tool for help. And, ucozfree.com file recovery software is worth trying. It allows you to recover deleted DOC/DOCX, XLS/XLSX, PPT/PPTX, PDF, CWK, HTML/HTM, INDD, EPS, etc. With a few clicks.

Give it a try to lớn get your lost Excel back immediately:


Step 1. Select location and click "Scan"

Choose the drive or a specific thư mục on Desktop or somewhere else where you lost the excel files, & click the "Scan" button.


Step 2. Locate your excel files

To quickly find the Excel files from the scan results, click the "Documents" option in the left panel. Choose "Excel", & click "Preview" to kiểm tra if the Excel files are the wanted ones.


Step 3. Recover Excel files

Finally, select the desired Excel files & click the "Recover" button. Then, select a folder to save the Excel files to another location.


2. Back Up Excel file Automatically

If you modify and change your worksheet frequently, turning on the AutoSave feature is a good idea. Or, you can manually copy & backup your tệp tin to another safe location in case of accident.

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Final Words

"Excel cannot xuất hiện the file "(filename)" .xlsx because the tệp tin format for file extension is not valid" is a normal error that you can face while opening an Excel file. With the help of the above methods, this error can easily be resolved without data loss.

If Excel cannot mở cửa the tệp tin problem is due to file corruption, the ucozfree.com tệp tin repair tool can help you fix and recover the Excel file with a few clicks pretty quickly. It is good at repairing photos, videos, documents, & other files on the hard drive, SD card, memory card, or any other storage medium. No matter whether they are lost or exist on your devices. It"s worth a shot.


Excel Cannot xuất hiện the file FAQs

The following four frequently asked questions are extremely relevant khổng lồ the "Excel cannot mở cửa the file because the tệp tin format or tệp tin extension is not valid" error. If you also have any of these problems, you can find the methods here.

1. How vày I fix the tệp tin format or file extension is not valid?

You can try to lớn fix the "Excel cannot xuất hiện the file because the tệp tin format or file extension is not valid" error by changing the tệp tin extension:

Step 1. Open your Excel file. On the taskbar, select "File" & then choose "Options" > "Export" > "Change tệp tin Type".

Step 2. You can directly change the tệp tin extension depending on the version of Excel installed. Click "Save As". Then, kiểm tra if the error "Excel cannot open the file" is resolved or not.

2. How vày I recover an Excel tệp tin format or file extension that is not valid?

You can restore the Excel file format, or the file extension is not valid from previous versions.

Select the damaged file. Right-click it and click "Properties" > "Previous Version". A list of previous versions will appear; you need to lớn select the option you are interested in and click "Restore" to recover. Previous versions come from tệp tin History or restore points.

3. What does tệp tin extension not valid mean?

"Excel cannot mở cửa the file "(filename)" .xlsx because the file format for file extension is not valid" is a common error that many users may encounter while opening a .xlsx file, especially when opening a spreadsheet received through an email. The possible reasons for this issue might be:

The Excel file is corrupt or damaged.The Excel file is not compatible with the version of MS Excel you"re using.

4. Why can"t I open an XLSX file?

When the Excel tệp tin is corrupted, not compatible with the Excel version, infected by the virus, or received by email, these are the common causes of the "Excel cannot xuất hiện the tệp tin because the tệp tin format or tệp tin extension is not valid" problem. If any of these problems appear, you can"t mở cửa your XLSX file.