Can BRU rename files within folders

Hello!
Attempting to simultaneously rename file extensions within multiple folders proves a challenge.
Is the operation within BRU's capabilities? Is it possible to select multiple folders (or alternatively a single folder containing multiple subfolders) in order for all files within those folders to have their extensions renamed?
Thanks in advance!
Attempting to simultaneously rename file extensions within multiple folders proves a challenge.
Is the operation within BRU's capabilities? Is it possible to select multiple folders (or alternatively a single folder containing multiple subfolders) in order for all files within those folders to have their extensions renamed?
Thanks in advance!