Why can't Quicktime Pro demux MPEG1 files?

After buying QuickTime Pro I discovered that I couldn't convert muxed MPEG1 files without losing the audio. I understand that QTP simply doesn't have that capability and now use MPEG Streamclip to demux the audio then I can import the video and demuxed audio file into iMovie and export it from there.
But why can't QTP demux it itself, to begin with? I don't see how a simple freeware app can do it but QTP, which isn't free, can't. I probably wouldn't have bought QTP if they spelled out clearly on the pages about Quicktime that it couldn't do this, just like how they point out the extra MPEG2 plugin you may need.
I don't regret purchasing QTP; I'm just disappointed that I didn't get everything I thought I was paying for, and that I have to take extra steps to convert old video clips.

Mike, it can't edit or convert Real, WMV and a lot of AVI's using some codecs as well. I think it would be a fair question if they ever represented that it could which they don't - in fact they say it will not export audio with muxed MEPG 1 , and 2 files.
It edits "editable" video while MPEG is a delivery format that is not that great to edit even if it is decent enough quality (since there are not actual frames each 1/30th of a second to edit for starters).
MPEG Streamclip is best looked at as not better than QT Pro but an adjunct to help do some file conversions (and with the latest version a LOT of file conversions) to a QT format that you could then use in QT pro to edit, add tracks to and so on. Or to DV for Life/FCE for editing more complex jobs.
This complaint or observation is often heard for iMovie and Final Cut as well and Apple says the same thing, don't use MPEG as source video for these editors - they are not MPEG editors and were not sold as such.

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[DISCLAIMER: My question is short, but my details are not. This is going to be a LONG read, but I wanted to make sure I provided all you helpful people with as much information as I could so that I could receive the best possible solution. So your patience and assistance is greatly appreciated!]
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Thing is, I don't have enough space on my Mac's direct hard drive to move my entire iPhoto Library there (where it works). That's why I am using an external hard drive to store (more space). So is there ANY way I can keep my iPhoto Library located on my external hard drive and have the library, albums and files recognized in the other iLife applications like iMovie???
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[my specs are listed below if that helps any]
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FYI... I am mounting my External HD before I launch iPhoto.
Also, I have also tried dragging the AlbumData.xml file that I created from the test iPhoto Library into my active iPhoto Library folder residing on my External HD. It would appear to be in the folder, but as soon as I clicked somewhere else in finder and than back into the folder, it would disappear. Not sure how to "point to it" either.
Karl, think maybe you could provide some hints on how to properly alias something or "point" to the AlbumData.xml file? I'd try it myself, but I don't wanna screw anything up by accident.
PS. As stated in the post above, there's a possibility my External HD is no longer Mac OS formatted... at which point I throw my hands up into the air and scream!
thanks for the tips thus far... everyone's so nice and helpful... I love it!
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