Usually it is located under Render Globals -> Ouput -> and the Click the Save Animation Box. Under type, select .mov and then select Animation File. It should bring you to where you want to "Save the File". From there just type in the name. Select Save and then Lightwave should open up for you again. You should then be able to select the options.
I will check it at work tomorrow and try get a screen shot of the pull down menu. I know on my PC I never get Quicktime options.
Glen