There are many methods to find the macros folder, this one is very direct, does not require showing hidden folders.
Step 1: Click on Start > Run

Step 2: Type in %appdata%

Step 3: Find the Razor folder, and open.

Step 4: Open the Macros folder. You will find all Razor macros, which can be edited in Notepad or similar. (I recommend Notepad ++).

Win 7: coming shortly.