newbie: OS X and answer file ?

[tom farrell]

Hi...

I want to allow a Mac OS X user to choose graphics files from a 
directory listing.

Is it possible, in OS X, to setup "answer file with filter" or 
"answer file of type" in such a way as to actually display as 
available jpeg, gif and png files? (where the answer to "Is it 
possible" does NOT include opening every file in a directory)

With just a simple use of "answer file of type...", some of the 
relevant graphics file are displayed correctly. Many are not. Looking 
at some of the non-selectable files (ie, the dimmed/greyed out ones) 
in ResEdit shows that they do have seem to have the correct filetype 
(JPEG, for example).

Does one have to do by hand what one had hoped "answer file" would do?

thanks in advance for any time you might have for a reply.

tom