Change extention of a database to my own application file.

Dear experts,

I have made a programm that uses a MS-ACCESS database.
I use the components ADOConnection and ADOQuery for that.
And everythings works fine. But I have a couple of questions:

1. Do you have to install MSACCESS on the computer for my application
   to open an Acces-database?
2. I want to make of the database (.MDB) my own application file (.PKD)
    How can I do that?
3. If I change the database extention .MDB to a .PKD is than still possible
    to open it with MSACESS.

Greetings, Peter Kiers