Bulk Rename Utility

I have about 500+ files that i need to rename. The problem that I am encountering is that the files are all date time stamped in the extension. How do I remove the last 16 characters from an extension?

Here is an example, the file starts out as:
FileName.jpg_20160101_073000

and I want the file to be
FileName.jpg

I am an idiot... I found the solution.

Renaming Options > Ignore > File Extensions

then set Remove to Last n to 16.

Great that you found the solution to your renaming task!