I download an .mde project , and by an "mde unlocker software" , I convert it to .mdb .
In converted database , when I want to create a new Module , it show this message:
" Microsoft helps protect this visual Basic for Applications Project with a password.You must supply the password in the visual Basic Editor before you can perform this operation."
Is there any way to find this password ?

Why did you need an MDE unlocker? Generally, the reason to use an MDE unlocker is if your backup copies of the MDB get lost or corrupted. In which case you would have password.

If you are trying to unlock someone else's work, shame on you.

I trying to unlock someone else's work , and I know that is very bad ,
But I want to learn !

If you want to learn there are MANY, MANY samples and templates for Access that are available for free. I've put some out there. There are also loads of books that teach, I've written one.

You don't have to try and steal someone else's work. Nor will we support you in doing that.

I mean I want to learn How can we do that ? (learn about opening visual basic editor in an .mde ).learning , only learning.

You can't. An MDE creates a pseudo compiled version of the MDB. There is no code left anymore. And the ability to open the VBE is disabled.