You can do it like this:
start browser.exe www.example.com
But. you need to set this to enviroment variables:
browser.exe C:\path\to\yourbrowser.exe
Search up a tutorial on how to setup enviromental variables based on your Windows
If you want to skip and use Internet Explorer, do this:
start iexplore.exe www.example.com
In another way you can also do this:
start C:\path\to\browser.exe www.example.com
But, if you want to use Chrome for example do this:
start C:\Program Files\Google\Chrome\Application\chrome.exe www.example.com
And if you want to use the same way for your code do this:
if %X% EQU 28 start iexplore.exe http://www.tele-live.com/mbc-max-en-direct-live-%DA%BA%C3%AA-%C2%A0%C3%AF-%C2%AB%C3%AF-%C3%AA%DA%BA%C3%A8%C2%AB-%C3%AA%C2%A0%DA%BA%C2%AC%C2%A9%20-video_0a915c1da.html
For example i want to use Chrome for this:
if %X% EQU 28 start C:\Program Files\Google\Chrome\Application http://www.tele-live.com/mbc-max-en-direct-live-%DA%BA%C3%AA-%C2%A0%C3%AF-%C2%AB%C3%AF-%C3%AA%DA%BA%C3%A8%C2%AB-%C3%AA%C2%A0%DA%BA%C2%AC%C2%A9%20-video_0a915c1da.html
Bye..