How to Change File Extension in Windows 10

You can change file extension in Windows 10 at any time you want and here is how you can do that:

Change File Extension for Individual File

Selected File name extensions option
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    Find the file for which you want to change the file extension.
Text file
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    Right-click on it and then click "Rename." 
Rename option in the context menu
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    Remove the file extension which is after the dot(.). Type the file extension you want and then hit "Enter" key. In this instance, I removed txt and replaced it with the html.
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    In the confirmation popup, click "Yes."
Confirmation popup

That is all. You've successfully changed the file extension.

HTML file

Change File Extension for Multiple Files

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    Put all the files for which you want to change file extension in a single folder.
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    Open that folder. Right-click on the File Explorer Address Bar and then click on "Copy address" option. It will copy the address of the folder.
Copy address option
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    Open Command Prompt.
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    Type cd. Hit Space Bar key and then paste the address of the folder you have copied (see the screenshot below). Press "Enter" key.
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    Now, type the following command:

ren *.* *.html

Command Prompt with commands including the command to change file extension of multiple files
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    Replace html with the file extension you want. Press "Enter" key. 

That is all. Now, you can see that all files in the folder got its file extension changed.

HTML files

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How to Change File Extension in Windows 10

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