Correct. Let's say you want to email it to your buddy , or somethin'. If it's in an EXEcutable format, your buddy won't need QuickTime.it opens a video , i guess the .exe is for availability for all computers instead of a proprietary format...
This is what I found @ http://filext.com/file-extension/exe:if they would want it to be available for all computers then it would definitely not be a .exe
This is what I found on a quick chat with mr google.
well you mentioned macThen tell me what computers (other than a Mac) won't run on.