On 2 Aug 2012, at 13:47, Rob McBroom <mailingli...@skurfer.com> wrote:

> On Aug 2, 2012, at 3:07 AM, Shane Stanley <sstan...@myriad-com.com.au> wrote:
> 
>> On 01/08/2012, at 1:07 AM, Rob McBroom <mailingli...@skurfer.com> wrote:
>> 
>>> Mail is, but so is TextEdit and I have no problem reading its prefs.
>> 
>> Are you sure you have no problem with TextEdit? It looks like when Mail 
>> moves its prefs to its container it deletes the old file, but TextEdit 
>> leaves its old one there. You may well be reading a pre-update TextEdit 
>> prefs file.
> 
> 
> I was all ready to say “Yes, I’m sure”, but the app isn’t actually reading 
> TextEdit’s prefs. It’s asking for com.apple.TextEdit.LSSharedFileList. 
> Reading the actual preferences doesn’t seem to work.
> 
> So maybe you can’t read the prefs from a sandboxed application? But that 
> isn’t documented anywhere that I can find.

Correct, sandboxed apps live in their own container, with their own preferences 
file. There is a temporary entitlement:

com.apple.security.temporary-exception.shared-preference.read-only

Use that as the key, and the bundle identifier of an app as the value. This 
will allow a sandboxed app to read another app's preferences. I don't know if 
the reverse applies though, having not had a need to try it.
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