WampServer

Thanks for your attention. I have three questions, please help:

1.
I have intalled a wamp using WampServer2.0i.exe which was downloaded sometim ago. Therefore, I fogot whether the WampServer2.0i.exe is 32bit or 64. But the wamp works fine on my Windows 7. Because the OS Windows 7 is 64bit, does that mean the working wamp must be 64bit also? If not, which means 32bit wamp can be working on a 64bit OS, how to find out if the installed wamp on my Windows 7 is 32 or 64?

2.
I am trying to connect the matlab to mySQL. To achieve this, I need to compile some cpp file which will needs the lib file of mySQL - libmySQL.lib. However I did not find the file under the mySQL directory which is under wamp. The file is usually located under directory: MySQL Server 5.1\lib\opt\. How to fix this kind of lib file related issue?

3.
I found out the wamp installation file is much smaller than the individual installation file of mySQL, PHP. I just wondering why? Does this compressed wamp has all functions of the system if installing mySQL, Apache, and PHP, one by one?

Thank you very much.