(re-sent as my original didn't get through)
Hi Wade, Edgar,
I wrote that sample application, so I'm sorry you had problems getting it working. As you worked out, it's fussy about the (number, and case of) file extensions it recognises. I've fixed those issues and uploaded a new version, as I'm sure that this will have caused other people problems too.
Edgar - you mentioned that you'd have done things differently. I started writing a more complex application, but realised that image handling on my Mac wasn't very fast, so I stripped the application back down, but thought it was useful to document what I'd produced as I had a lot of trouble getting to a core SystemWindow-based application. Are you saying that (i) using SystemWindow is not the approach you'd have taken, or (ii) that's not how you'd have implemented a SystemWindow-based application? (or both!).
I'd appreciate any comments you have, and may add them to the application as warnings to anyone who picks it up in future.
Thanks, Michael