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ReadMore:

https://www.addictivetips.com/windows-tips/batch-change-rename-file-extensions-in-windows/
http://ww3.yehiaeg.com/
http://www.electrasoft.com/

http://download.cnet.com/Extension-Changer/3000-2072_4-10394272.html
http://filext.com/file-extension/
https://sourceforge.net/projects/b-e-c/files/?source=navbar
https://drive.google.com/file/d/1WJ9FGKb6dO_m0aPU91IGMk1Pq-iFgyoN/view

https://www.youtube.com/watch?v=b4z-dENYPzw

MULTIPLE FILE TYPE CHANGER - YouTube

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BLOCK JAVASCRIPT FILE BY GOOGLE CHROME - YouTube

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Extension Changer is a cool little software that lets you change the extension easily. Since the command line method is limited to few extensions, this software can change almost any extension.

All you have to do is drag the file who’s extension you would like to change. If you want to batch change the file extensions, then you can drag the files one by one or you can drag the whole folder(it will also ask if you would like to include the sub folders or not) which contains the files.

After selecting the files, enter the extension you want to change it into and click Change.

Change Multiple File Extensions in Command Prompt