4 Ways to Change a File Extension - wikiHow
https://www.wikihow.com/Change-a-File-Extension
How to Change File Extension Open a file in its default software program. Click the File menu, and then click Save As. Choose a location for the file to be saved. Name the file. In the Save As dialog box, look for a dropdown menu labeled Save As Type or Format. Choose a new file type for the file from the dropdown menu.
Open a file in its default software program.
Click the File menu, and then click Save As.
Choose a location for the file to be saved.
Name the file.
In the Save As dialog box, look for a dropdown menu labeled Save As Type or Format.
Choose a new file type for the file from the dropdown menu.
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