On Wed, 29 Jul 2015 15:30:08 -0400, PeterN
wrote:

On 7/29/2015 11:20 AM, Tony Cooper wrote:
On Wed, 29 Jul 2015 11:04:58 -0400, Stephen G. Giannoni
wrote:

What's the best program for such a batch rename ?

If you don't already have and use Lightroom or Bridge, and just want a
free program that batch re-names, download FastStone
http://www.faststone.org/ Image Viewer 5.3. It will batch re-name in
any format you want.

I use it as my photo viewer when I'm not in Lightroom and find it has
many useful functions in re-naming, moving images, copying images, and
opening images in editing programs.

One can always use the DOS command: ren *.a *.b

It's quicker to batch rename in Windows file explorer. Highlight,
click, type.