output filename of mux tool

[fanglyfish]

I'm trying to use the mux tool to create an avi file from an h264 video file and an mp3 file for the audio. After specifying the video and audio files to use in the mux tool and selecting AVI in the "Mux as" selection I click the Mux button and it finishes near instantaneously without prompting me for the output filename or location.

[Case]

I think the AVI Mux Tool only takes video.avi + audio.mp3, thus the video should already be in an AVI container.
It won't prompt for an output filename or location. It should save as [video_filename].muxed.avi in the same location as the video file.
I'm not sure how it handles H.264 video, or if it even does handle it. Most AVIs I see have XviD video, while H.264 is usually in an .mp4 container.
If you're still working on your (disguised) MKVs, then have you tried Emmgunn's excellent MVKtools 2.0 or its predecessor MoKgVm2DVD?

[fanglyfish]

MKVTools got the job done, thanks. Still would have been nice to figure out how to convert them in ffmpegX though, it recognized that the files were MKV and got the audio/video codecs right. It just wouldn't pull the right audio track out.