I am trying to find out whether this modification is possible in Windows and have found a number of potential files. I would appreciate if you could give me an idea what other lines of code should be in the file.

Some of the files of interest:

C:\Users\Username\AppData\Roaming\Apple Computer\Preferences\com.apple.Safari.plist

C:\Program Files\Common Files\Apple\Mobile Device Support\SyncServices\Clients\com.apple.Safari\Contents\Windows\com.apple.Safari

C:\Program Files\Common Files\Apple\Mobile Device Support\SyncServices\Clients\com.apple.Safari\Contents\Resources\com.apple.Safari.plist