QuickTime hijacks file type

I want to associate text files ending with .sml with the Aquamacs Emacs application. If I bring up the info panel on just such a file, and try to use the "Change All..." button, the "Open with:" selector immediately switches back to QuickTime.
I can associate an individual file with Aquamacs via the "Always Open With" checkbox in the "Choose Application" dialog box, but that association only applies to that file, and occasionally switches back to QuickTime under circumstances I haven't pinned down yet. (And it only works if I don't hit the "Change All" button.)
I've confirmed in System Preferences->Quicktime->MIME Settings that QuickTime is not associated with SMIL files. I found a Default Apps utility that confirms that .sml extensiona are associated with Aquamacs, and that the file type "EMAx" is also associated with Aquamacs.
I used the Property List Editor to look at com.apple.LaunchServices.plist and the entries for public.filename-extension for "lex" and "grm" that I also created for org.gnu.aquamacsemacs match the entry for "sml", and they still work.
All this happened when I forked out for the "pro" version of QuickTime. I've already asked this question in the QuickTime discussion group with no luck. I would be hugely obliged for any advice that leads to a solution, or to anyone who can forward this to whatever engineer in apple can do something about it.
MacBook Pro Mac OS X (10.4.8) QuickTime Player Pro 7.1.3

Thank you for the suggestion.
I put QuickTime (and DivX) in the trash, and only then would files ending with .sml open with Aquamacs. Even the files that still had the QuickTime icon opened correctly.
However, when I re-installed a freshly downloaded version of QuickTime, the problem simply reappeared.
I'll try to see if people more familiar with Aquamacs know why this is happening.

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Quicktime hijacks file types and won't relaease them

Have to have it for Ipod but I really hate Quicktime. It's worse than AOL on my computer. For God's sake let me decide what files you open. The only way I can see MPG files is to uninstall Quicktime.

Ok, this one is fairly simple:
1. Go to a/the file in the filetype that u don't want quicktime to open (in your case a .mpg file)
2. Right-click it and put your mouse over "Open with", when the thing pops up, hit "Choose Program..."
3. Find the program u actually want to use (i'm presuming its Windows Media Player)
4. Click it and then check the box below that says "Always use selected program to open this file type"
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Well, hope it works out, post back here and if it dosn't I'll run through some more complicated stuff
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QuickTime hijacks file types

I recently forked out for QuickTime Pro. Before that I had .sml file types rigged to open with Aquamacs Emacs (as SML source files). But now, .sml files are re-associated with QuickTime, and I can't switch them back.
I select a .sml file, select "Get Info," change the "Open with" option to Aquamacs via the "Other..." option, and then selet the "Change All..." button. But as soon as I select the "continue" option, the "Open with" option changes back to "QuickTime Player.app" without explanation.
If I don't select "Change All..." it does change the file type association for that file, but I want to change it for every file of type .sml.
When I go into System Preferences->Quicktime->MIME Settings, it claims that QuickTime is not associated with SMIL files (whatever they are).
Thanks for any advice,
I'm on a MacBook Pro running 10.4.7 (which strangely enough isn't an option on the message posting OS selector).
-thant
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Thanks for the reply.
I used the Property List Editor to look at com.apple.LaunchServices.plist and the entries for public.filename-extension for "lex" and "grm" that I also created for org.gnu.aquamacsemacs match the entry for "sml", and they still work. And as I said, the "sml" extension used to work just fine, so I don't think the problem is Aquamacs.
One other thing that happened between when it worked and when it didn't was that I installed DivX Player, which, interestingly, is the other default option that shows up when I try to change the application association of a .sml file. But I can't find any way in the DivX Player to know which file types the DivX player wants to control. And even if it did want to control .sml file name extensions, why does the association revert to Quicktime and not DivX?
-thant
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QuickTime hijacks file type

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