Can't open file without Unicode version of Speech Bubble extension

I tried to open an old game I hadn't worked on in a while, but it refused to do it without all the extensions I used in it. I was able to install most of them, but the Speech Bubble extension I installed from the Extension Manager it won't accept because it's not the Unicode version.

I only want to open this game file so I can remove all the extensions. That way I don't keep running into this problem. But I can't get at any of the data from the outside. What should I do?

Well, that got it to fail in a slightly different way, so that's something. I tried your suggestion after attempting to open the file and getting stuck at the lack of a speechbubble.mfx extension. When I hit the "retry" button, I got an error message telling me there was a problem loading the frame that uses the speech bubble extension, and do I want to just remove that frame and continue. I said yes, and then it stopped responding.

I am able to open other game files just fine, and even add the "speech bubble" object (actually just another Active Backdrop object) to the game. Also, sometimes when I try to open the first file with the fake extension installed, it just goes straight to not responding.

What should I do now?