I can't understand Robmeyers so called problem ...
I did a test and suggested to find & replace "mouse" by "mouse123" ...
The program proposed 323 modifications and I pressed the button "Replace" ...
Afterwards I did a registry search for "mouse123" and the program found 323 items, thus exactly the number as mentioned above :
Conclusion: the program did the job well for me.
Obviously no error or bug in find & replace? :