Gregory Lypny wrote:

Richard, I’m afraid that changing the extension does not cause the type to 
change.

It's worse than you think:  file types have no meaning anymore in OS X.

In versions prior to Snow Leopard they did, but they were deprecated in Snow Leopard and will eventually be gone from the system entirely.

Instead, the way forward is fully dependent on the file name extension.

One of the byproducts of the loss of file type and creator codes is that we no longer have a means of binding a file to a particular app without adjusting the "Open With..." settings in the Finder's Get Info window. If you choose a reasonably unique file type extension (e.g. ".livecode") you have better chances of it launching the app you want, but for more generic types it's anyone's guess as to what will happen.

Given the ambiguity inherent in the new paradigm with regard to which app will be launched when a document is double-clicked, for generic types like "txt" and "csv" the best move is to educate users to open a file from within their application.

--
 Richard Gaskin
 Fourth World
 LiveCode training and consulting: http://www.fourthworld.com
 Webzine for LiveCode developers: http://www.LiveCodeJournal.com
 LiveCode Journal blog: http://LiveCodejournal.com/blog.irv

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