Are you looking for a way to change the extension of multiple files without resorting to software? Renaming multiple file extensions using traditional methods can be very time-consuming. So, in this guide, you can follow the specific steps below to change the extension of all files simultaneously in a directory:
Step 1: Put all the files you want to rename into the same folder, then copy that folder to your Desktop.

Step 2: Access Run by pressing Start -> type run into the Search programs and files box, then select Run (or you can use the Windows

In the Run dialog box, enter the command cmd in the Open field, then click OK or press Enter.

Step 3: In the cmd window, type the command cd to navigate to the directory containing the file you want to change the extension of. For example, if I have a folder named PPT on my Desktop, I would type cd desktop/PPT.

Step 4: Proceed to change the file extension (here, I want to change the pps file extension to ppt), I will use the command Ren *.pps *.ppt.

Where:
The current file extension is .pps.
The file extension I need to convert to is .ppt.
Next, use the Enter key to complete the command.
At this point, the system will swiftly change the extension from pps to ppt.
And here is the final outcome:

So, have we successfully changed the extensions of all files in the directory simultaneously and swiftly, haven't we?