SkidSolo -
The DVD writer doesn't care what the files are that you want to burn onto it.
You should be able to store ANY files on the DVD, but if you don't have the right software on your PC to use the files (e.g. Quicktime), you won't be able to access them.
Do you mean that you can store the QT files on a DVD, but you cannot then playback the files that you transfer to the DVD - e.g. in a DVD player?
Can you play the QT files on your PC? If so, what is the requirement to convert them to something else? Do you want others to be able to view them? If so, can't they use Quicktime?