There's a golden rule: Never ever change the generated files !!
But there are some cases where fixing generated files is inevitable. For that I've found a small handy program called FART (Find And Replace Text).
hxxp://fart-it.sourceforge.net/
No need to install. Just copy fart.exe into your C:\ drive then create a *.bat file.
For example:
filename: myFart.bat
@ECHO OFF
cd "C:\"
fart "C:\xampp\htdocs\app_dev\ewcfg14.php" "192.168.1.2" "127.0.0.1"
EXIT
Running this file will change connection string IP address inside ewcfg14.php from "192.168.1.2" to "127.0.0.1".
Use with caution. Always remember the golden rule.