How to change file extension of a large number of files?

March 2, 2006 10:19 AM

How can I change/append an extension of a large number of files at once?

I have about 1000 files that have no extension. I want them to all keep their same filename, but add the same extension to each. Is there a way I can do this through the Windows XP command-line, or a batch file? Otherwise, what software might I need?

posted by Ekim Neems to computers & internet (7 comments total)

Are they all in the same directory? If so, at a command line, cd into that directory and type:

ren *. *.EXT

where EXT is your extension.
posted by blue mustard at 10:22 AM on March 2, 2006

Someone recommended this program to me on AskMe before. It's free and it works wonderfully.
posted by apple scruff at 10:30 AM on March 2, 2006

You could also use the bulk renamer utility here.
posted by Manouk at 10:31 AM on March 2, 2006

Or if you have Python installed, the script here (self-link).
posted by grouse at 11:15 AM on March 2, 2006

This is the best I've used, free and spyware-free
posted by sluglicker at 1:05 PM on March 2, 2006

oops. Sorry...here
posted by sluglicker at 1:06 PM on March 2, 2006

I'm most fond of Lupas Renamer. You can google it if you're still looking the right tool.
posted by stavrosthewonderchicken at 6:22 PM on March 2, 2006