File renaming through multiple subdirectories

[lizardcry]

Any help would be greatly appreciated.

I'd like to have a bash script recurse through multiple subdirectories and simply add an extension to all files found in the subdirectories. The extension is ".wpd". I would think I could pipe the output of 'find' to the 'mv' command. But, I am cannot figure it out.

Again, any help would be appreciated.

[Alighieri]