Cannot Play Avi Movies But Plays Avi Animation?

I'm using sample code which i will paste below, it includes in the form a comman button, animation control and activeX control. it plays clipart files but when i try to play a movie inavi format such as a movie trailer it says it unable to open..what could i do to make allow all types of avi files.



Private Sub cmd2_Click()
With Cd2
.Filter = "avi (*.avi)|*.avi"
.ShowOpen
End With
With An2
.AutoPlay = True
.Open Cd2.fileName
End With
End Sub

this is sample code from msn website and works for clipart avi files but it seems not to open normal avi movies.

what would have to be done in order to allow any avi to play and or is there any other way i can play avi (any sort) on the form and which also allows me to choose any avi file (i.e from a table etc)

cheers in advance