How Do I Remove the UTC Timestamp from files backed up by FileHistory?

Since I was having so many problems with Windows 8.1 on my ASUS Vivobook x202e, I backed up my files with Windows File History onto an external hard drive and restored the machine to factory settings so I could start using Windows 8 again, with which I have had no issues. 

I record a lot of audio with a freeware recording studio called Audacity, which saves thousands of sound files for each audio project. Because the File History renamed all the files with the UTC timestamp, Audacity does not recognize these thousands of files unless I rename them by deleting the timestamp. I have about 7 audio projects I need to access -- it would take many tedious days to rename all the files.

For example, the original file name was:

e0000d79.au

On my external hard drive, the file appears as:

e0000d79 (2013_11_24 01_59_07 UTC).au

Is there a way to somehow restore these files to their original file name without the timestamp? I looked in File History but was unable to find an option like that.

Thank you,

James

EDIT: I figured it might take some kind of software running a script to do this for me. I found this Powershell script for removing 8 digits that come after an underscore in any file name:

from http://stackoverflow.com/questions/16064268/powershell-remove-timestamp-from-filename

Get-ChildItem *.txt | Where {$.Name -match '\d{8}.txt' } | Rename-Item -NewName {$.Name -replace '\d{8}'}

I had to use Powershell to fix an issue with Windows 8.1 not too long ago, but I am not familiar with how it works. Is there some similar script I could run? For example, deleting anything that comes after a beginning parenthesis would work, as there are no parentheses in the names of the files I need cleaned up.