Macro with Special Characters

[HippyCraig]

I have a script that needs to modfiy a setup project. Its updating the default install location.

The value I want to enter is the following:
[ProgramFilesFolder][Manufacturer]\\[ProductName]

I have doubled up the special characters when the value of the macro is set, but when I place the values back into the file its getting evaluated to many times. First when its set, then when I use a regex to place it back in the file. I have had to more than double up on the special characters. See attached file

Any advice?