FAQ.How to know if QuickTime is installed on any target and can play MPEG 4 movies?
Feedback.

Answer: Try this code:
Example:

dim q as QTComponentInformationMBS

q=new QTComponentInformationMBS

// "eat " = Movie importers
while q.NextComponentOfType("eat ")
  if q.SubType="MP4 " then
    MsgBox "found: "+q.Name+ " codec"
  end if
wend

Notes: If you find a MP4 movie importing codec you can be sure that a MP4 movie can be opened.