Well, depending on what the file name is, you have to extract it into the file, that has the same file that your trying to extract.
Example:
File you have: "Add-ons.rar"
Place to extract: "Blockland"
Or if your file that you have has its own name, open it, and right click on the folder in it.
Example:
File you have: "RocketLauncher.rar"
Inside that folder: "Add-ons"
Place to extract the "Add-ons" folder that is is the "RocketLauncher.rar" folder: "Blockland"
And if for some reason it won't work in the game, just move the files from the folder that yo have, into the folder name they were in.
Example:
Inside the downloaded file: "Weapon_RocketL.cs" located in the "Add-ons" file.
Then you would put it in the "Add-ons" folder.
Another example:
Inside downloaded file: "RocketL.dts" located in the "Shapes" file. (Which is located in the Add-ons folder)
Then you would go to the "Blockland" folder, then the "Add-ons" folder, then put the "RocketL.dts" into the "Shapes" folder.
Oh, by the way, remember to check off the Add-on in the Add-ons list when you make a game. :D
