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changing the "open with application" value for a file
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changing the "open with application" value for a file


  • Subject: changing the "open with application" value for a file
  • From: Jim Brandt <email@hidden>
  • Date: Sat, 23 May 2009 12:16:19 -0500

Under OS X, what is it that determines which application opens a
file when it is double clicked and how is it manipulated via
Applescript?

The problem:

I am downloading multiple files that are ".m4v" type videocasts.
By default, on my machine, they would open in iTunes. If I use
"Get Info" for each file, I can tell it to open in Quicktime
instead. When I look at the properties for this file, neither
the file creator or the file type is filled in.

I realise the file type is the old OS 9 4 byte code that was
unique to each application and could be manipulated to force a
particular program to open a file when it's icon was double
clicked.

But what causes this to happen under OS X and how do I change it
using Applescript?

Jim
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