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					Originally Posted by  dendrin
					 
				 
				Boilsoft Video Joiner does it the quickest and best because it doesn't reencode the files, but is not free. Many others can do it but require a full reencode which takes alot of time and potentially lowers the quality. 
			
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  Asftools is also pretty good. It is compact and fast because no re-encoding is involved.
http://www.asftools.de/