Please try to search for the Category.xml file within your C: drive or which ever path you used during installation of QlikView.
The ProgramData folder is generally hidden. Try going to run and put the path you mentioned.
"C:\ProgramData\QlikTech\ManagementService\QVPR"
Also don't forget to stop QlikView services and take a backup of the xml file before you make any changes. (Try it on your test environment before making any changes on Prod).