I have been able to remove the UTC timestamp. This is how I did it.
After going round and round in circles, phoning Microsoft and searching the web, I still came up with no answers on how to remove the UTC time stamp.
What happened with me was that I installed windows 10 over 32 bit windows 7 home premium. The newly installed windows 10 didn't respond well and so I took the decision to do a clean install of windows 10 and at the same time change from 32 bit
to 64 bit. After making a backup I then installed (clean install through custom setup) windows 10 64 bit and I have to say it is fast and responsive with no glitches.
I then decided to restore from my file history backup but no matter how I tried it would not accept it. However I could see my files, (thousands of them) but they all had the long UTC time stamp in brackets. On manually moving
these files over to my directory folders the UTC time stamp was still there. With no help from other sources I changed my search to apps that could modify file names. I came across the open source "Bulk Renaming Utility" the link is http://www.bulkrenameutility.co.uk/Main_Intro.php
This is how it worked for me: Load up the "Bulk Renaming Utility and in the "Remove 5" box" tick R. In "Words box" enter the time code information with brackets that you
can copy and paste from one of the file history files (it is the same for all of the files for that particular file history backup) In "Crop" enter with the drop down .. AFTER. Tick "Trim" (this
will remove any gaps). Untick Add, Auto date Numbering.
Then select (Crtl A) as many files as you can and press "Rename" or Ctrl R. You should see all your selected files back to normal with the UTC time stamp removed.
Repeat this for files in all folders.
Regards, Martin