I tested alot of other "joiners" but they all re-encoded - which took too long and usually altered the original encoded spec and MovieMaker was just too slow. The best and fastest tool I found is at: http://www.amigoshare.com/mjsintro.html The eval edition works for any # of WMVs of any length (it just adds a watermark to the video). I just works at the file level. It definitely does join files w/ the same res/bitrate/fps/etc. and it definitely does not join files that differ in any of these areas. It is as basic as it gets - no transitions, no options to recode, etc. - but that is exactly what I needed. At this point, it was definitely worth the $20 (maybe alittle overpriced for what it does but its the only app that worked the way I wanted it to).