plugins primer

[mucous_biscuit]

I am beginning to learn about plugins. Is the "plugins" folder already included in the program, or am I supposed to create the folder [in XP - documents and settings/user/application data/eteks/sweethome3d]?
I downloaded ExportToSH3F and I am getting an error "Cant open home". I've read a lot of the information but I'm missing something.
Appreciate any help.

[Puybaret]

The plugins folder is created only in case of need.
If you get a Can't open home error, it's probably because your browser replaced the sh3p extension by sh3d. Change it manually and double click again on the file.
What browser did you use?

[mucous_biscuit]

In Firefox 4 - I used 'open with SweetHome3D'...therein was my problem.
After I tried saving it to desktop and double clicking from there, it installed perfectly and created the plugins folder.
(the extension was okay)
How do I view the source code -as an example of Plug-in classes architecture?

Thank you for your help. This is a very fine program.

[Puybaret]

As explained in the Plug-ins developer guide, a .sh3p file is just a zip file.
As they are not so big, I (and other developers too) generally include their source code with it.