The "Allow AVI File to Play" menu option sets a
flag read by the OnAssertPlayAVIFile method; this
method is used to prevent playing AVI files.
(This could be due to a lack of driver software
or for performance reasons.)
 
(Note: Assert methods normally are used to abort
all further processing of an action, while the
Handle Methods modify the processing. These
two methods can each be overridden in code by
direct assignment for Assert types and virtual
overriding for Handle types.)


