How should AVI files be detected in avifile?

[Julius Schwartzenberg]

James Hawkins wrote:
> Write and submit tests that show the correct behavior, then submit a
> patch that makes Wine match that behavior.  In general, questions like
> "What's the right fix?" can be answered by thorough, well-thought out
> tests.

I can write tests for the cases I just described and my fix would work, 
but I don't think it'd be the right way. I'm not sure what a better way 
would be though, I think also because I do not fully understand the COM 
architecture.