.groovy in set up?

I knew that we were going to be downloading this IDE, so I downloaded it and started the install before starting the this particular lesson (I halted for further guidance at the default plug-ins part).

In the instructions that Craig Dennis provided for installing and setting up (Windows), task number four shows to check the checkboxes for ".java" and ".groovy" in the "Create Associations" dialog box.

When I went through that part of it, there were actually three "associations" to choose from, the two I already mentioned and another that I forgot the name of (I know that it may have been an added thing since the video).

I only selected the ".java" association when I was going through the set up. Since Craig is showing to select ".groovy" also, did I make a mistake on not doing so, and what will that cause to happen or not happen? Once setup is completely finished, will I be able to go back into the settings and that ".groovy" association if I am going to need it? If so, can anyone tell me real quick how to get to where I need to do it?

If I need to uninstall, and re-install, that is fine too. Just didn't know what ".groovy" was or if it is something pertinent to the class we are doing.