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Published on 02.16.09 by Brent Trahan

Change a File’s Extension

Learn how to change a file’s extension in Windows 7.

A file’s extension tells the computer what type of file it is. The extension consist of a unique combination of letters and numbers that follow a period at the end of the file name. For example: an Adobe PDF file has the extension .pdf, or a Microsoft Word document will have a .doc or .docx extension. So a Microsoft Word 2010 document would look like word-document.docx if the file extension were showing instead of word-document. The computer keeps a list of known file extensions handy so that it knows how to deal with each extension it may come across.

By default Windows hides file extensions so that the file names are less confusing for non-technical people.

Learn how to change file’s extensions in Windows 8

Change a File’s Extension

  1. First, you need to enable the show file extension option.
  2. Next, click on the file you want to change the file extension one time, pause for a second, and click it again.


  3. The file’s name will become highlighted. Erase the file’s extension and replace it with the new one, and then press Enter on your keyboard.
  4. Click Yes when asked if you’re sure you want to change the file’s extension.


Still need help? Ask your computer question now.

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33 Responses to “Change a File’s Extension”

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  1. DM12 says:

    It doesnt ask me if i want to change the extension.. it just puts it in the name and doesnt change the file type

  2. Help? says:

    How do you erase the file’s extension? FAST PLEASE

    • -- says:

      Go to Control Panel, open “Folder Options”, click on the “View” tab and check the “Hide extensions for known file types”. that’s it. Hope this helped.

  3. Hemanth says:

    just download the icon change software and change the extention

  4. Dennis says:

    You may need to also uncheck the box that says “Hide extensions for known file types” also.

  5. Helen says:

    Thanks, helped a lot!

  6. Max says:

    thanks for the help, even the windows 7 microsoft website couldnt help me enough on this. This solution made me realize i need to change folder options to display extensions with name then i could manually change it.

  7. fyza says:

    i really really need help. all my exe file has been change into qc file type. i’ve tried the above method to rename my qc file type to exe, it disappear.

  8. gracie says:

    thank you so much! i’ve been wanting to download a song and hear it!

  9. F. D says:

    I would like to thank you for the perfect guide.

  10. joe says:

    When i do this it just changes the icon to the blank white thing HELP

    • Bucketowater says:

      My video icon is white also, and my file type says “file”. It also does not allow me to change the file type. HELP!!!

  11. niks says:

    Thanks for the guidance to change the extension. It really works!!!!!!!!1 Cheers :)

  12. omi says:

    thx a lot for your Guidance

  13. FAHAD says:

    thank you very much.It works.Learning new thing is always cheerful.

  14. Drake says:

    this is retard WTF why is this so difficult in windows 7???????

    • Recklemus says:

      It is simple with windows seven. In Control Panel you just have to change the view in the right hand corner from “category” to “large icons” and it is step by step after that.

  15. Oki says:

    Really helpful guide. Can’t believe why someone would ever want to hide the extensions. And even if some people would, why the heck did microsoft put that setting as default.

  16. Nechar says:

    Doesnt work in windows 7

  17. vrian cantalejo says:

    this site helped me so much…..i bow down to you..thank u so much so much..

  18. Douglas says:

    Thanks it worked exactly like it said.

  19. Lisa says:

    I have tried all of the steps, but when I import my movies to moviemaker there is still no sound. Can anyone help?

  20. Cynthia says:

    I have changed the extensions on my video files, not having any usability issues as far as being able to hear and see the video as it was originally), but when I try to add them to the Windows DVD Maker, (for .MOV files, .WMV files, and .AVI files, so far) I get an error message thar tells me that these extensions are not compatible, even though these extensions are listed in the “video” click-down… Help! What extension will guarantee that these video files can be added to the “DVD Maker”!

  21. Zia says:

    Thanks a lot. very nice sharing

  22. v3 says:

    many thanks. i really need this tutorial :)

  23. Rasmus says:

    This tutorial is gold!! :)
    It works JUST as it says it would.
    I gotta give it to you man.. You rock!! :D

  24. jegathees says:

    thanks bro………

  25. fit says:

    thax for your help. it’s very usefull :)

  26. Ib says:

    thanks Help? it works perfectly

  27. yahj says:

    thanks!.. very helpful.. ^^,

  28. yadni says:

    its not working

  29. Ravi says:

    Awesome. I didn’t had time to explore and this came in handy. Thank you. This is really helpful.

  30. Suji Sri says:

    I can’t understand

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