Most of the movies I download open in little quicktime windows on my computer... Not that great for family viewing!!!

I have been told to download RAR files for full screen viewing, I don't know much about these things but sofar with limewire most of the files displayed in a search are mpeg, avi, wmv, and occasionally one or two others. I have yet to see a RAR file on Limewire.

Any light on this subject?