Just an off-the-cuff suggestion...have you installed anything recently that "hijacked" the file association? When I installed Mobipocket Creator, I already had the ETI ebook software installed, and MC hijacked my OPF associations aware from the ETI program.
I was able to fix the association, but the file icon still looks like it's tied to MC, not ETI.
Anyway, not the same problem, but something similar might be overriding your settings...
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