Dear Dan,
Quote:how does hyphy determine which data/tree files are hyphy-readable?
Since HyPhy is a Carbon application (which still has a good old Mac OS classic .rsrc file), it simply has a list of creator codes (.TTXT etc - mostly text files) - this determines what is selectable in the file dialog box. BBEdit, CodeWarrior, TextEdit etc documents should all be readable.
Internally, HyPhy opens everything as a text file, and based on the mode (whether the user is opening a batch file, data file, tree file etc, as selected via File->Open->) parses the contents accordingly.
I have been meaning to have file open dialogs default to 'All Files', but last time I checked it, I couldn't find the flag in Apple's Navigation services API to do it.
Sorry for the nuisance, but in the meantime one is forced to select the option to show all files in the navigation box manually.
What application made the files you are trying to open?
HTH,
Sergei