This method is used when there are too many files in a folder whose extension you want to change.
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Step 1 Create a txt file inside of the folder which has all the files in it.
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Step 2
ren *.ext *.ext
ren comes from rename. First extension is the extension you have, second extension is the extension that you want to change to.
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Step 3
Then save the txt file as change_extension.bat
When you run .bat file all of the extensions of files will change to extension you want