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I had to strip off the first part of a bunch of file names. You can do this inside of Windows Powershell, using this simple script:
get-childitem *.dat | rename-item -newname { [string]($._name).substring(9) }

The file extension and the numeric value are variable based on your needs.

WARNING: THIS WILL AFFECT EVERY FILE IN YOUR CHOSEN DIRECTORY, so move all the files that you need to rename to their own folder. And, it can't be redone, so make a backup beforehand, and make sure you're in the correct folder before you execute.