Find string in .ini and replace the value in front of it

[temp3r]

I have a file like this:
 

<random text in here>
<random text in here>
<random text in here>
<random text in here>
WTemail@example.com41609=72978

WT41609=2

WTemail@example.com41610=2978

This file is edited everyday automatically by a program that i run what i wanted was to make a script to edit the first line and find the first string:

WTemail@example.com*=

(the value in front of the email gets automatically raised that's why i used a * for a random value then the = )
And edit the value in front of it to 86400...

Anyone knows how to do it?

I started with AutoIt, and i have no idea how to make it..

Edited December 2, 2013 by zylor

[karlkar]

Take a look at '?do=embed' frameborder='0' data-embedContent>>

Although it is for XML, the first post contains the code that will work with every file (after some modifications)