Ok, all correct and helpful. However, it does not change the fact that as an 
end-user you have to make a decision and move any file you plan to do serious 
work on to a more permanent location.

Regards,
Andreas
 

On 25/Jan/2011, at 18:39 , Maxwell, Adam R wrote:

> 
> On Jan 25, 2011, at 07:17, Adam R. Maxwell wrote:
> 
>>> AFAIK the rule is that the resource a temporary file has been using (disk 
>>> space, and if RAM or virtual memory would be involved, this is arbitrated 
>>> by the system and users should not meddle with this) is basically released, 
>>> as soon as the temporary file is closed. Since quitting an application 
>>> implicitly also closes normally all its files, they are released to be 
>>> possibly deleted whenever the system sees fit.
>> 
>> The system unlinks all files older than 3 days in the temporary directory, 
>> which doesn't affect open files (although IIRC it will screw up file 
>> packages if you only have a single file in it open).  IIRC the schedule is 
>> in /System/Library/LaunchDaemons/com.apple.bsd.dirhelper.plist.  It has 
>> nothing to do with quitting an application; the PDF files that I just 
>> downloaded are still there after quitting the browser and the PDF viewers.
> 
> 
> As an addendum, here's the problem report that I recalled seeing.
> 
> http://www.cocoabuilder.com/archive/cocoa/227830-can-dirhelper-delete-files-in-nstemporarydirectory-while-app-is-running.html
> 
> His bug report was probably redirected to /dev/null, as the problem still 
> exists on 10.6.  Cocoa doesn't have an equivalent to the old 
> kChewableItemsFolderType, which was cleaned up only on restart.
> 
> 
> 
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