.biz is bad because it's a TLD (
http://www.brandonevans.biz). I'd be OK with changing the terminology from movies to replays, but we can't do this halfway; either call them replays EVERYWHERE in BizHawk or don't. This would require the modification of a lot of dialog, which I'm totally OK with, but understand what we're getting ourselves into. It would also probably mean that TASVideos should reflect this new terminology, another thing I'm not sure the staff would be willing to do. If they are, I'll support it.
A separate decision we have to make before we go about renaming the filetype is
whether or not the text and binary movie files should have different types or not. Although I can't possibly claim that the primary motivation of that topic wasn't getting .tas out of BizHawk, I still think it's probably a good idea to use different filetypes. If you all agree, what do we do? Should we just append "t" or "b" to the end of whatever extension we decide to use? Should we append to one and not the other or both? Which one?
FatRatKnight, you are my hero for putting the last nail in the coffin of .tas, an extension I've been protesting since the very first commit I made for BizHawk (Last May), but I'm not sure I agree with your third point. I don't think it's a secret that adelikat wants this to be highly integrated with TASVideos, him telling me that he wants TASVideos.org to be its home (See its
main Wiki). I don't necessarily think this is a bad thing, as yes, this is primarily written for TASVideos. However, we shouldn't actively cater to TASers for things that don't only apply to TAS. This is what .tas did, and it would certainly alienate me if I weren't a TASer (Even still, I'd be hesitant to use it to record unassisted test runs). As such, I'm glad to see it go. Thanks adelikat for being open minded and listening to our concerns, no matter how ridiculously trivial they might be. Don't ever listen to someone telling you that you should rename the emulator, though, no matter how connected it might be to a spammy service.